Question

the length of a rectangle is 2times that of a square whose perimeter is 80cm.If breadth of a rectangle is 20cm.Then the area in cm² of the rectangle exceeda the area of a square by options a.15cm² b.300cm² c.400cm² d.100cm²​

Answer 1

Answer:

let the length of square be X

perimeter=4*X=80

X=80/4=20

so length of rectangle =2*20=40

area =l*b=40*20=800

area of square =20^2=400

800-400=400