Question

find the circumference and area of each circle. use 3.14 for pi.
7.
8.

Explanation:

Step1: Solve for Problem 7 (Radius \( r = 8 \) ft)

Circumference:

The formula for the circumference of a circle is \( C = 2\pi r \). Given \( \pi \approx 3.14 \) and \( r = 8 \) ft.

$$ C = 2 \times 3.14 \times 8 = 50.24 \text{ ft} $$

Area:

The formula for the area of a circle is \( A = \pi r^2 \).

$$ A = 3.14 \times 8^2 = 3.14 \times 64 = 200.96 \text{ sq ft} $$

Step2: Solve for Problem 8 (Diameter \( d = 10 \) m, so Radius \( r = \frac{d}{2} = 5 \) m)

Circumference:

Using \( C = \pi d \) (or \( C = 2\pi r \)).

$$ C = 3.14 \times 10 = 31.4 \text{ m} $$

Area:

Using \( A = \pi r^2 \) with \( r = 5 \) m.

$$ A = 3.14 \times 5^2 = 3.14 \times 25 = 78.5 \text{ sq m} $$

Answer:

• Problem 7: Circumference = \( 50.24 \) ft, Area = \( 200.96 \) sq ft
• Problem 8: Circumference = \( 31.4 \) m, Area = \( 78.5 \) sq m