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9-81.

Find the missing side lengths of each rectangle (a and c) or square (b and d). Homework Help ✎

a.

b.

c.

d.

To find the area of a rectangle, multiply the length
by the width.

100 cm ( x cm ) = 500 cm2

Solve for x.

See (a).

16.4 cm

Recall the properties of a square. All the side lengths must be equal.

Since one side is already given, we can conclude that the other side is also 8 cm.

See (b).