Video: Finding the Perimeter of a Rectangle by Counting Unit Lengths

Find the perimeter of the shaded rectangle.


Video Transcript

Find the perimeter of the shaded rectangle.

We know that perimeter is the distance around. We need to find the distance around this rectangle by counting unit lengths. We can see that the left width is two. The width on the right is also two. We need to find the length by counting: one, two, three, four, five, six, seven, eight, nine, 10. The length at the bottom is 10. And that means the length at the top is also 10.

Since the perimeter is the distance all the way around, we add up the four distances we found. The perimeter equals two plus 10 plus two plus 10. Two plus 10 equals 12. Two plus 10 again equals 12. 12 plus 12 equals 24. The perimeter of the shaded rectangle is 24.

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