Question

the length of a rectangle is 20 cm more than its breath . if the perimeter is 100 cm find the dimension of the triangle

Answer 1

let ,the breadth=b cm
then , length=(20+b)
perimeter=100 cm
2(l+b)=100
2(20+b+b)=100
2(20+2b)=100
40+4b=100
4b=100-40
b=60÷4
breadth=15 cm
length=20 +b
20+15=35 cm