Video

Perimeter word problem: skating rink (Full video)

Khan Academy

Supporting grades: 3

Description: Lindsay finds the area of an irregular shape by decomposing it into 2 rectangles. Created by Lindsay Spears. How many meters of handrail does Gus need? So Gus definitely needs to put some handrails 40 meters here and 20 meters here, but that is not enough. As somebody who doesn't know how to skate, I very much hope Gus puts handrail on this length and this length also.

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