# Find by the rectangle formula P = 2 (a + b) side b, if P = 316, a = 45m.

August 23, 2021 | education

| Given:

a = 45 m;

b =? m;

P = 316 m

P = 2 * (a + b) – where, a – length, b – width.

Let’s find the width of the rectangle:

2 * (45 + b) = 316;

90 + 2b = 316;

2b = 316 – 90;

b = 226: 2;

b = 113.

check: 2 * (a + b) = 2 * (45 + 113) = 2 * 158 = 316 – true

Answer: 113 m. Width of the rectangle.

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