Question

Find the length of the rectangle whose perimeter is 420cm and breath is 85 cm

Answer 1

perimeter of rectangle =2(l+b)

420=2(l+85)

420-  170=2l

250=2 l

l =250÷2

l=125

length of rectangle is 125

Answer 2

Perimeter of rectangle = 420
2×(l+b). =420
2× (l+ 85). = 420
(l. + 85). = 420/2=210
l. = 210-85
l= 125
length of rectangle is 125 cm