10. Geometry

Perimeter and Area of Polygons

10. Geometry

Perimeter and Area of Polygons: Videos & Practice Problems

Video Lessons

Concept

Perimeter

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Problem

Find the perimeter of the isosceles triangle (two sides have equal length).
$Isosceles triangle with two equal sides of 16 inches and a base of 21 inches labeled for perimeter calculation.$

$106$ in

$74$ in

$37$ in

$53$ in

Problem

Find the perimeter of a rectangle with length 12 yd and width 8 yd.

$20$ yd

$40$ yd

$24$ yd

$32$ yd

Example

Perimeter Example 1

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Example

Perimeter Example 2

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Concept

Area

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Problem

Find the area of the figure.
$Square with each side measuring 12 centimeters, labeled for calculating area.$

$144$ cm²

$48$ cm²

$576$ cm²

$24$ cm²

Problem

Find the area of the figure.
$Equilateral triangle with side length 3 feet and height 3.5 feet, labeled for area calculation.$

$10$ ft²

$10.5$ ft²

$5.25$ ft²

$5$ ft²

Problem

Find the area of the figure.
$Trapezoid with parallel sides 6 mi and 9 mi, height 5.5 mi, labeled for area calculation.$

$41.25$ mi²

$82.5$ mi²

$49.5$ mi²

$33$ mi²

Example

Area Example 3

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Example

Area Example 4

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