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Chapter 3: Q.3.87 (page 368)

Find the length of a rectangle with: perimeter 80 and width 25.

Short Answer

Expert verified

The length of the rectangle is 15.

Step by step solution

01

Step 1. Given information

The perimeter of the rectangle, P=80.

The width of the rectangle is, w=25.

We need to find the length, l of the rectangle.

02

Step 2. Use the formula for the perimeter of the rectangle.

The perimeter of the rectangle is, P=2(l+w)

which means

P2=l+wP2-w=ll=P2-w

03

Step 3. Substitute values in l=P2-w.

We get

l=802-25=40-25=15

The length of the rectangle is 15.

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