Find the side $ a $ of a rectangle if side $b = 5$ and perimeter $P = 60$.
Answer
$a = 25$
Explanation
To find side $ a $ use formula:
$$ P = 2 a + 2 b $$After substituting $ P = 60 $ and $ b = 5 $ we have:
$$ 60 = 2 a + 2 \cdot 5 $$ $$ 60 = 2 a + 10 $$ $$ 2 a = 60 - 10 $$ $$ 2 a = 50 $$ $$ a = \dfrac{ 50 }{ 2 } $$ $$ a = 25 $$This page was created using
Rectangle Calculator