The perimeter of a rectangle is $42 c m .$ If its breadth is $8 c m$ , then its area = ${}_{_}c m 2$

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Solution

Step1:calculate length from perimeter of rectangle formula
Perimeter of Rectangle $= 2 x (L e n g t h + B r e a d t h)$
$42 = 2 (L e n g t h + 8) L e n g t h = 21 - 8 = 13 c m$
Step 2:Calculate the area .
Area $= L e n g t h x B r e a d t h$
$= 8 x 13 = 104 c m 2$

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