Question

the radius of a piece of wire circular in shape is 10.5 cm. it is reshaped into shape of a rectangle whose length is 20 cm. Find the breadth of the rectangle.

Answer 1

Circumference of circle=perimeter of rectangle

$circumference = 2\pi \: r$
$= 2 \times \frac{22}{7} \times 10.5$
=66cm

perimeter of rectangle=2(l+b)
66=2(20+b)
$\frac{66}{2} = 20 + b$
33=20+b
33-20=b
b=13

breadth of the rectangle=13cm

Answer 2

Answer:

13

Step-by-step explanation:

Circumference=2πr

=2*22/7*10.5

=66cm

Perimeter of rectangle=2L+B

66=2 20+b

66/2=20+B

33=20+B

33-20=B

B=13