Question

plz somebody I need these and I'm failing math cause of these problems.

Answer 1

Answer:

1.A =113.04  cm^2

2.A =616  in^2

Step-by-step explanation:

To find the area of a circle we use the formula

A = pi * r^2  if we know the radius or

A = pi * (d^2/4) if we know the diameter

In problem 1 we know the radius

A = pi * r^2

A = pi * (6)^2

A = 36*pi

Using 3.14 for pi

A = 36* 3.14

A =113.04  cm^2

In problem 2 we know the diameter

A = pi * d^2/4

A = pi * (28)^2/4

A = pi 784/4

A = 196

Using 22/7 for pi

A = 196*22/7

A =616  in^2

Answer 2

Answer:

1. Area of the circle with 6 cm radius is $113.14 cm^2$.

2. Area of the circle with 28 cm diameter is $616 cm^2$.

Step-by-step explanation:

1. Radius of the circle ,r=  6 cm

Area of the circle , A= $\pi r^2$

$A=\pi (6 cm)^2=\frac{22}{7}\times 6 cm\times 6 cm=113.14 cm^2$

Area of the circle with 6 cm radius is $113.04 cm^2$.

2. Diameter of the circle = d = 28 cm

Radius of the circle , r = $\frac{28 cm}{2=14 cm$

Area of the circle , A= $\pi r^2$

$A=\pi (14 cm)^2=\frac{22}{7}\times 14 cm\times 14 cm=616cm^2$

Area of the circle with 28 cm diameter is $616cm^2$.