Measure and Sketch Angles - 4th Grade Math
Card 1 of 20
What is the name of each side of an angle, starting at the vertex?
What is the name of each side of an angle, starting at the vertex?
Tap to reveal answer
A ray. Angles are formed by two rays extending from a common point.
A ray. Angles are formed by two rays extending from a common point.
← Didn't Know|Knew It →
What is the name of the point where the two rays of an angle meet?
What is the name of the point where the two rays of an angle meet?
Tap to reveal answer
The vertex. The vertex is where two rays meet to form an angle.
The vertex. The vertex is where two rays meet to form an angle.
← Didn't Know|Knew It →
What type of angle is $90^\circ$: acute, right, obtuse, or straight?
What type of angle is $90^\circ$: acute, right, obtuse, or straight?
Tap to reveal answer
Right. An angle of exactly $90^\circ$ is a right angle.
Right. An angle of exactly $90^\circ$ is a right angle.
← Didn't Know|Knew It →
What is the measure of a straight angle in degrees?
What is the measure of a straight angle in degrees?
Tap to reveal answer
$180^\circ$. A straight line forms a straight angle of exactly $180^\circ$.
$180^\circ$. A straight line forms a straight angle of exactly $180^\circ$.
← Didn't Know|Knew It →
What is the measure of a right angle in degrees?
What is the measure of a right angle in degrees?
Tap to reveal answer
$90^\circ$. A square corner forms a right angle of exactly $90^\circ$.
$90^\circ$. A square corner forms a right angle of exactly $90^\circ$.
← Didn't Know|Knew It →
What is the measure of a full turn (one complete circle) in degrees?
What is the measure of a full turn (one complete circle) in degrees?
Tap to reveal answer
$360^\circ$. A complete rotation around a point equals $360^\circ$.
$360^\circ$. A complete rotation around a point equals $360^\circ$.
← Didn't Know|Knew It →
What type of angle is $115^\circ$: acute, right, obtuse, or straight?
What type of angle is $115^\circ$: acute, right, obtuse, or straight?
Tap to reveal answer
Obtuse. $90^\circ < 115^\circ < 180^\circ$, so it's obtuse.
Obtuse. $90^\circ < 115^\circ < 180^\circ$, so it's obtuse.
← Didn't Know|Knew It →
Which type of angle has a measure less than $90^\circ$: acute, right, or obtuse?
Which type of angle has a measure less than $90^\circ$: acute, right, or obtuse?
Tap to reveal answer
Acute. Angles smaller than $90^\circ$ are called acute angles.
Acute. Angles smaller than $90^\circ$ are called acute angles.
← Didn't Know|Knew It →
Which type of angle has a measure greater than $90^\circ$ but less than $180^\circ$?
Which type of angle has a measure greater than $90^\circ$ but less than $180^\circ$?
Tap to reveal answer
Obtuse. Angles between $90^\circ$ and $180^\circ$ are obtuse angles.
Obtuse. Angles between $90^\circ$ and $180^\circ$ are obtuse angles.
← Didn't Know|Knew It →
What type of angle is $25^\circ$: acute, right, obtuse, or straight?
What type of angle is $25^\circ$: acute, right, obtuse, or straight?
Tap to reveal answer
Acute. $25^\circ < 90^\circ$, so it's an acute angle.
Acute. $25^\circ < 90^\circ$, so it's an acute angle.
← Didn't Know|Knew It →
What is the angle measure if one ray is at $0^\circ$ and the other ray is at $150^\circ$ on the same protractor scale?
What is the angle measure if one ray is at $0^\circ$ and the other ray is at $150^\circ$ on the same protractor scale?
Tap to reveal answer
$150^\circ$. The angle measures the difference: $150^\circ - 0^\circ = 150^\circ$.
$150^\circ$. The angle measures the difference: $150^\circ - 0^\circ = 150^\circ$.
← Didn't Know|Knew It →
What is the angle measure if one ray is at $0^\circ$ and the other ray is at $90^\circ$ on the same protractor scale?
What is the angle measure if one ray is at $0^\circ$ and the other ray is at $90^\circ$ on the same protractor scale?
Tap to reveal answer
$90^\circ$. The angle measures the difference: $90^\circ - 0^\circ = 90^\circ$.
$90^\circ$. The angle measures the difference: $90^\circ - 0^\circ = 90^\circ$.
← Didn't Know|Knew It →
What is the missing measure: two adjacent angles form a straight angle; one is $70^\circ$. What is the other?
What is the missing measure: two adjacent angles form a straight angle; one is $70^\circ$. What is the other?
Tap to reveal answer
$110^\circ$. Adjacent angles forming $180^\circ$: $180^\circ - 70^\circ = 110^\circ$.
$110^\circ$. Adjacent angles forming $180^\circ$: $180^\circ - 70^\circ = 110^\circ$.
← Didn't Know|Knew It →
What type of angle measures exactly $180^\circ$?
What type of angle measures exactly $180^\circ$?
Tap to reveal answer
Straight angle. An angle that forms a straight line measures $180^\circ$.
Straight angle. An angle that forms a straight line measures $180^\circ$.
← Didn't Know|Knew It →
What is the first placement step to measure an angle with a protractor?
What is the first placement step to measure an angle with a protractor?
Tap to reveal answer
Place the protractor center on the vertex. The protractor's center hole must align with the angle's vertex.
Place the protractor center on the vertex. The protractor's center hole must align with the angle's vertex.
← Didn't Know|Knew It →
What must you line up with the $0^\circ$ mark before reading an angle on a protractor?
What must you line up with the $0^\circ$ mark before reading an angle on a protractor?
Tap to reveal answer
One ray of the angle (the baseline ray). Align one ray with $0^\circ$ to read the angle correctly.
One ray of the angle (the baseline ray). Align one ray with $0^\circ$ to read the angle correctly.
← Didn't Know|Knew It →
Which scale should you read on a protractor to measure correctly?
Which scale should you read on a protractor to measure correctly?
Tap to reveal answer
The scale where the baseline ray starts at $0^\circ$. Use the scale that shows $0^\circ$ at your baseline ray.
The scale where the baseline ray starts at $0^\circ$. Use the scale that shows $0^\circ$ at your baseline ray.
← Didn't Know|Knew It →
Identify the correct measurement: the baseline ray points to $0^\circ$ on the inner scale; the other ray hits $120^\circ$ inner and $60^\circ$ outer.
Identify the correct measurement: the baseline ray points to $0^\circ$ on the inner scale; the other ray hits $120^\circ$ inner and $60^\circ$ outer.
Tap to reveal answer
$120^\circ$. Read the inner scale since baseline is at inner $0^\circ$.
$120^\circ$. Read the inner scale since baseline is at inner $0^\circ$.
← Didn't Know|Knew It →
Identify the correct measurement: the baseline ray points to $0^\circ$ on the outer scale; the other ray hits $35^\circ$ outer and $145^\circ$ inner.
Identify the correct measurement: the baseline ray points to $0^\circ$ on the outer scale; the other ray hits $35^\circ$ outer and $145^\circ$ inner.
Tap to reveal answer
$35^\circ$. Read the outer scale since baseline is at outer $0^\circ$.
$35^\circ$. Read the outer scale since baseline is at outer $0^\circ$.
← Didn't Know|Knew It →
Identify the correct measure if the aligned ray starts at $0^\circ$ and the other ray hits $40^\circ$.
Identify the correct measure if the aligned ray starts at $0^\circ$ and the other ray hits $40^\circ$.
Tap to reveal answer
$40^\circ$. Read where the second ray crosses the protractor scale.
$40^\circ$. Read where the second ray crosses the protractor scale.
← Didn't Know|Knew It →