Question

1. Find the area and perimeter of a circle when its
(i) radius = 3.5 cm (ii) diameter = 14 cm.​

Answer 1

( 1 )

Area of circle = πr²

Here, r = 3.5cm

so That :-

Area of circle = 22/7 × 3.5 × 3.5

= 38.5 cm²

perimeter of circle = 2πr

= 2 × 22/7 × 3.5

= 22 cm²

( 2 )

R = d/2 = 14/ 2 = 7 cm

Area of circle = πr²

Here, r = 7cm

so That :-

Area of circle = 22/7 × 7 × 7

= 154 cm²

perimeter of circle = 2πr

= 2 × 22/7 × 7

= 44 cm²

Here, your answers complete

Answer 2

Answer:

given,

raduis= 3.5 cm

diameter= 14 cm

$area \: of \: circle \: = \pi \: {r}^{2}$

= 3.14 × 3.5 × 3.5 = 38.465 cm sq.

$perimeter \: of \: circle \: = \: 2\pi \: r$

=2 × 3.14 × 3.5 = 21.98 cm