Question

find the area of the circle with the following dimensions
1) diameter 21 m
2) radius 7 cm
3) diameter 7 cm
4) radius 20 cm

Answer 1

hey!

1. radius = 21/2
area=πr^2
=22/7×21/2×21/2
=346.5 m^2



2. area = πr^2
=22/7×7×7 = 22/7×49= 154cm^2

3. radius=7/2
area =πr^2
=22/7×7/2×7/2
=38.5cm^2


4. area=πr^2
=22/7×20×20
=1257.14 cm^2

Answer 2

$\bf\huge\boxed{\boxed{\bf\:Hello\:Mate}}}$

1) Diameter = 21

Radius = $\bf\huge\frac{21}{2}$

Area of circle = πr^2

= $\bf\huge\frac{22}{7}$ × $\bf\huge\frac{21}{2}$ × $\bf\huge\frac{21}{2}$

$\bf\huge\boxed{\bf\:=\:346.5\:m^2}}}$

2) Area of circle = πr^2

= $\bf\huge\frac{22}{7}$ × 7 × 7

=  $\bf\huge\frac{22}{7}$ × 49

$\bf\huge\boxed{\bf\:=\:154\:cm^2}}}$

3) Diameter = 7

Radius = $\bf\huge\frac{7}{2}$

Area of circle = πr^2

= $\bf\huge\frac{22}{7}$ × $\bf\huge\frac{7}{2}$ × $\bf\huge\frac{7}{2}$

$\bf\huge\boxed{\bf\:=\:38.5\:cm^2}}}$

4. Area of circle = πr^2

= $\bf\huge\frac{22}{7}$ × 20 × 20

= $\bf\huge\boxed{\bf\:=\:1257.14\:cm^2}}}$

$\bf\huge\boxed{\boxed{\bf\:Solved\:Mate}}}$