The length of a rectangle is 10 cm. If its perimeter is 28 cm, find the area
A.
30cm\(^2\)
B.
40cm\(^2\)
C.
60cm\(^2\)
D.
80cm\(^2\)
Correct answer is B
perimeter = 2( length + breadth)
→ 28 = 2 (10+ b)
14 - 10 = b
b = 4
Area = length x breadth
10 x 4 → 40cm\(^2\)