Question

Find the area and the circumference whose radius is 21cm

Answer 1

Answer:

Step-by-step explanation:

Radius, r = 21 cm

1. Area of the circle = π $r^{2}$

                                = (22/7) x $21^{2}$ $cm^{2}$

                                = 1386 $cm^{2}$

2. Circumference of the circle = 2 π r

                                                  = 2 x (22/7) x 21 cm

                                                  = 132 cm

Answer 2

Answer:

Arra of circle = pi r^2

=22/7 × 21 × 21 = 1386 cm^3

Circumference of a circle = 2 pi r

= 2 × 22/7 × 21

=132cm