How to find an angle in a rhombus - PSAT Math

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In Rhombus , $m \angle H = 45 ^{\circ }$ . If $\overline{RO }$ is constructed, which of the following is true about $\Delta RHO$ ?

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The figure referenced is below.

The sides of a rhombus are congruent by definition, so $\overline{RH}$ \cong $\overline{HO}$ , making $\Delta RHO$ isosceles. It is not equilateral, since $m \angle H = 45 ^{\circ }$ , and an equilateral triangle must have three $60 ^{\circ}$ angles.

Also, consecutive angles of a rhombus are supplementary - as they are with all parallelograms - so

$m \angle HRM = $180^{\circ}$ - m \angle H = $180^{\circ}$ - 45 ^{\circ} = $135^{\circ}$$

A diagonal of a rhombus bisects its angles, so

$m \angle HRO = $\frac{1}{2}$ m \angle HRM = $\frac{1}{2}$ \cdot 135 ^{\circ } = $67$\frac{1}{2}$^{\circ }$$

Similarly, $m \angle HOR = $67$\frac{1}{2}$^{\circ }$$

This makes $\Delta RHO$ acute.

The correct response is that $\Delta RHO$ is acute and isosceles, but not equilateral.

In Rhombus , $m \angle H = 45 ^{\circ }$ . If $\overline{RO }$ is constructed, which of the following is true about $\Delta RHO$ ?

Tap to see back →

The figure referenced is below.

The sides of a rhombus are congruent by definition, so $\overline{RH}$ \cong $\overline{HO}$ , making $\Delta RHO$ isosceles. It is not equilateral, since $m \angle H = 45 ^{\circ }$ , and an equilateral triangle must have three $60 ^{\circ}$ angles.

Also, consecutive angles of a rhombus are supplementary - as they are with all parallelograms - so

$m \angle HRM = $180^{\circ}$ - m \angle H = $180^{\circ}$ - 45 ^{\circ} = $135^{\circ}$$

A diagonal of a rhombus bisects its angles, so

$m \angle HRO = $\frac{1}{2}$ m \angle HRM = $\frac{1}{2}$ \cdot 135 ^{\circ } = $67$\frac{1}{2}$^{\circ }$$

Similarly, $m \angle HOR = $67$\frac{1}{2}$^{\circ }$$

This makes $\Delta RHO$ acute.

The correct response is that $\Delta RHO$ is acute and isosceles, but not equilateral.

In Rhombus , $m \angle H = 45 ^{\circ }$ . If $\overline{RO }$ is constructed, which of the following is true about $\Delta RHO$ ?

Tap to see back →

The figure referenced is below.

The sides of a rhombus are congruent by definition, so $\overline{RH}$ \cong $\overline{HO}$ , making $\Delta RHO$ isosceles. It is not equilateral, since $m \angle H = 45 ^{\circ }$ , and an equilateral triangle must have three $60 ^{\circ}$ angles.

Also, consecutive angles of a rhombus are supplementary - as they are with all parallelograms - so

$m \angle HRM = $180^{\circ}$ - m \angle H = $180^{\circ}$ - 45 ^{\circ} = $135^{\circ}$$

A diagonal of a rhombus bisects its angles, so

$m \angle HRO = $\frac{1}{2}$ m \angle HRM = $\frac{1}{2}$ \cdot 135 ^{\circ } = $67$\frac{1}{2}$^{\circ }$$

Similarly, $m \angle HOR = $67$\frac{1}{2}$^{\circ }$$

This makes $\Delta RHO$ acute.

The correct response is that $\Delta RHO$ is acute and isosceles, but not equilateral.

In Rhombus , $m \angle H = 45 ^{\circ }$ . If $\overline{RO }$ is constructed, which of the following is true about $\Delta RHO$ ?

Tap to see back →

The figure referenced is below.

The sides of a rhombus are congruent by definition, so $\overline{RH}$ \cong $\overline{HO}$ , making $\Delta RHO$ isosceles. It is not equilateral, since $m \angle H = 45 ^{\circ }$ , and an equilateral triangle must have three $60 ^{\circ}$ angles.

Also, consecutive angles of a rhombus are supplementary - as they are with all parallelograms - so

$m \angle HRM = $180^{\circ}$ - m \angle H = $180^{\circ}$ - 45 ^{\circ} = $135^{\circ}$$

A diagonal of a rhombus bisects its angles, so

$m \angle HRO = $\frac{1}{2}$ m \angle HRM = $\frac{1}{2}$ \cdot 135 ^{\circ } = $67$\frac{1}{2}$^{\circ }$$

Similarly, $m \angle HOR = $67$\frac{1}{2}$^{\circ }$$

This makes $\Delta RHO$ acute.

The correct response is that $\Delta RHO$ is acute and isosceles, but not equilateral.

In Rhombus , $m \angle H = 45 ^{\circ }$ . If $\overline{RO }$ is constructed, which of the following is true about $\Delta RHO$ ?

Tap to see back →

The figure referenced is below.

The sides of a rhombus are congruent by definition, so $\overline{RH}$ \cong $\overline{HO}$ , making $\Delta RHO$ isosceles. It is not equilateral, since $m \angle H = 45 ^{\circ }$ , and an equilateral triangle must have three $60 ^{\circ}$ angles.

Also, consecutive angles of a rhombus are supplementary - as they are with all parallelograms - so

$m \angle HRM = $180^{\circ}$ - m \angle H = $180^{\circ}$ - 45 ^{\circ} = $135^{\circ}$$

A diagonal of a rhombus bisects its angles, so

$m \angle HRO = $\frac{1}{2}$ m \angle HRM = $\frac{1}{2}$ \cdot 135 ^{\circ } = $67$\frac{1}{2}$^{\circ }$$

Similarly, $m \angle HOR = $67$\frac{1}{2}$^{\circ }$$

This makes $\Delta RHO$ acute.

The correct response is that $\Delta RHO$ is acute and isosceles, but not equilateral.

In Rhombus , $m \angle H = 45 ^{\circ }$ . If $\overline{RO }$ is constructed, which of the following is true about $\Delta RHO$ ?

Tap to see back →

The figure referenced is below.

The sides of a rhombus are congruent by definition, so $\overline{RH}$ \cong $\overline{HO}$ , making $\Delta RHO$ isosceles. It is not equilateral, since $m \angle H = 45 ^{\circ }$ , and an equilateral triangle must have three $60 ^{\circ}$ angles.

Also, consecutive angles of a rhombus are supplementary - as they are with all parallelograms - so

$m \angle HRM = $180^{\circ}$ - m \angle H = $180^{\circ}$ - 45 ^{\circ} = $135^{\circ}$$

A diagonal of a rhombus bisects its angles, so

$m \angle HRO = $\frac{1}{2}$ m \angle HRM = $\frac{1}{2}$ \cdot 135 ^{\circ } = $67$\frac{1}{2}$^{\circ }$$

Similarly, $m \angle HOR = $67$\frac{1}{2}$^{\circ }$$

This makes $\Delta RHO$ acute.

The correct response is that $\Delta RHO$ is acute and isosceles, but not equilateral.

In Rhombus , $m \angle H = 45 ^{\circ }$ . If $\overline{RO }$ is constructed, which of the following is true about $\Delta RHO$ ?

Tap to see back →

The figure referenced is below.

The sides of a rhombus are congruent by definition, so $\overline{RH}$ \cong $\overline{HO}$ , making $\Delta RHO$ isosceles. It is not equilateral, since $m \angle H = 45 ^{\circ }$ , and an equilateral triangle must have three $60 ^{\circ}$ angles.

Also, consecutive angles of a rhombus are supplementary - as they are with all parallelograms - so

$m \angle HRM = $180^{\circ}$ - m \angle H = $180^{\circ}$ - 45 ^{\circ} = $135^{\circ}$$

A diagonal of a rhombus bisects its angles, so

$m \angle HRO = $\frac{1}{2}$ m \angle HRM = $\frac{1}{2}$ \cdot 135 ^{\circ } = $67$\frac{1}{2}$^{\circ }$$

Similarly, $m \angle HOR = $67$\frac{1}{2}$^{\circ }$$

This makes $\Delta RHO$ acute.

The correct response is that $\Delta RHO$ is acute and isosceles, but not equilateral.

How to find an angle in a rhombus - PSAT Math

In Rhombus , . If is constructed, which of the following is true about ?

In Rhombus , . If is constructed, which of the following is true about ?

In Rhombus , . If is constructed, which of the following is true about ?

In Rhombus , . If is constructed, which of the following is true about ?

In Rhombus , . If is constructed, which of the following is true about ?

In Rhombus , . If is constructed, which of the following is true about ?

In Rhombus , . If is constructed, which of the following is true about ?

In Rhombus , $m \angle H = 45 ^{\circ }$ . If $\overline{RO }$ is constructed, which of the following is true about $\Delta RHO$ ?

In Rhombus , $m \angle H = 45 ^{\circ }$ . If $\overline{RO }$ is constructed, which of the following is true about $\Delta RHO$ ?

In Rhombus , $m \angle H = 45 ^{\circ }$ . If $\overline{RO }$ is constructed, which of the following is true about $\Delta RHO$ ?

In Rhombus , $m \angle H = 45 ^{\circ }$ . If $\overline{RO }$ is constructed, which of the following is true about $\Delta RHO$ ?

In Rhombus , $m \angle H = 45 ^{\circ }$ . If $\overline{RO }$ is constructed, which of the following is true about $\Delta RHO$ ?

In Rhombus , $m \angle H = 45 ^{\circ }$ . If $\overline{RO }$ is constructed, which of the following is true about $\Delta RHO$ ?

In Rhombus , $m \angle H = 45 ^{\circ }$ . If $\overline{RO }$ is constructed, which of the following is true about $\Delta RHO$ ?