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High School Math : How to find the perimeter of a polygon

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Example Questions

Example Question #1 : Plane Geometry

What is the perimeter of a regular hendecagon with a side length of 32?

Possible Answers:

334

320

384

352

Correct answer:

352

Explanation:

To find the perimeter of a regular hendecagon you must first know the number of sides in a hendecagon is 11.

When you know the number of sides of a regular polygon to find the perimeter you must multiply the side length by the number of sides.

In this case it is 11*32=352 .

The answer for the perimeter is 352 .

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Example Question #1 : Other Polygons

All segments of the polygon meet at right angles (90 degrees). The length of segment $\overline{AB}$ is 10. The length of segment $\overline{BC}$ is 8. The length of segment $\overline{DE}$ is 3. The length of segment $\overline{GH}$ is 2.

Find the perimeter of the polygon.

Possible Answers:

$\dpi{100} \small 40$

$\dpi{100} \small 42$

$\dpi{100} \small 46$

$\dpi{100} \small 44$

$\dpi{100} \small 48$

Correct answer:

$\dpi{100} \small 46$

Explanation:

The perimeter of the polygon is 46. Think of this polygon as a rectangle with two of its corners "flipped" inwards. This "flipping" changes the area of the rectangle, but not its perimeter; therefore, the top and bottom sides of the original rectangle would be 12 units long $\dpi{100} \small (10+2=12)$ . The left and right sides would be 11 units long $\dpi{100} \small (8+3=11)$ . Adding all four sides, we find that the perimeter of the recangle (and therefore, of this polygon) is 46.

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Example Question #3 : Plane Geometry

What is the perimeter of a regular nonagon with a side length of ?

Possible Answers:

150

135

120

105

Correct answer:

135

Explanation:

To find the perimeter of a regular polygon, we take the length of each side, , and multiply it by the number of sides, .

P=s*l

In a nonagon the number of sides is , and in this example the side length is .

P=9*15=135

The perimeter is 135 .

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Example Question #2 : Geometry

Find the perimeter of the following octagon:

Possible Answers:

$96\ m$

$56\ m$

$76\ m$

$66\ m$

$86\ m$

Correct answer:

$96\ m$

Explanation:

The formula for the perimeter of an octagon is P = 8(side) .

Plugging in our values, we get:

$P = 8(12\ m)$

$P = 96\ m$

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High School Math : How to find the perimeter of a polygon

Study concepts, example questions & explanations for High School Math

All High School Math Resources

Example Questions

Example Question #1 : Plane Geometry

Example Question #1 : Other Polygons

Example Question #3 : Plane Geometry

Example Question #2 : Geometry

All High School Math Resources

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