Question

Find the length of of a rectangle whose perimeter is 100 cm and breadth is40 cm?​

Answer 1

Answer:

let the length of rectangle be x and breadth be y

as we know that

perimeter of rectangle =2 (length + breadth )

40=2 (x+y)

x+y=20

y=20-x

area of rectangle =length ×breadth

100=xy

x (20-x)=100

20x-x^2=100

x^2-20x+100=0

(x-10)^2=0

x=10cm

y=10cm

so length and breadth are equal .which is 10 cm each

PLZ MARK AS BRIANLIEST,FLW ME AND THX FOR THE SUPERB QUESTION

Answer 2

Answer:

10 cm

Explanation:

perimeter=100= 2(l+b)

                        =2(40+l)

                        =80+2l

                   100-80=2l

                    20=2l

                    l=20/2

                    l=10