What is the area of a circle whose diameter is 70 cm?

Answer 1

Area of a Circle (A) = pi times the radius (r) squared

A = (pi) (r)2

Diameter of a Circle (d) = 2 times the radius (r)

d = 2r

First, find the r

Since the diameter (d) = 70 cm, then

70 cm = 2 r

(70 cm)/2 = r

r = 35 cm

Now that you have found the value of the radius (r),

you can plug in r for the equation for the area (A) of a circle:

A = (pi) (35 cm)2

A = (pi) 1225 cm2

At this point you can multiply 1225 cm2 by pi with a calculator to get

the value of 3848.45100065 which can be simplified to 3848.5 cm2

Answer 2

The formula to calculate the area of a circle is A = πr^2, where r is the radius of the circle. Since the diameter is given, we first need to find the radius by dividing the diameter by 2: 70 cm / 2 = 35 cm. Now, we can plug the radius into the formula: A = π(35 cm)^2 ≈ 3848.45 cm^2. Therefore, the area of the circle with a diameter of 70 cm is approximately 3848.45 square centimeters.