(c) 70 cm
Explanation:
Given length and breadth of a rectangle are in the ratio 4:3
And diagonal= 25 cm
Let ratio in multiple of x i.e. 4x and 3x
According to the Pythagoras theorem we can write as
(4x)2+(3x)2=252
16x2+9x2=625
25x2=625
X2=625/25=25
x=5
Length = 20 cm
Breadth = 15 cm
Perimeter= 2(l +b) = 2(20+15) = 2(35) = 70 cm