Question

find the each sum with explanation

Answer 1

6 =60cm. and 7 = 8squares.

Answer 2

1】so the object is closed type and all sides are equal
$perimeter=20×3=60$

2】area of rectangle
$area=lenght×breadth$
$area=40×20=800$
$area \:of \:square=10×10=100$
$squares \:can \:be \:formed$
$\frac{800}{100}=8$

3】perimeter of rectangle
$2(l+b)=64$
$2(3x+x)=64$
$2(4x)=64$
$8x=64$
$x=8$