Question

1) A dinner plate has a radius of 4 inches. What is the plate's area?
2) A gymnast has to hang for a ring that has a circumference of 12.56 inches. What is the ring's radius.

Answer 1

Answer:

1......area = ( pi ) × 4^2 sq.inches

= 16× 3.14 sq.inches

= 50.24 sq.inches

2.....2 × (pi) × r = 12.56 inches

2× 3.14 × r =12.56 inches

r = 2 inches

Answer 2

Answer:

1) area of the plate is 50.14 inch square

2)radius of the ring is 2 inch

Step-by-step explanation:

1) radius r= 4 inches

area of the plate is

$a = \pi {r}^{2} \\ a = \pi \times 4 ^{2} \\ = 16\pi \\ = 50.14$

area of the plate is 50.14 inch square

2) ring that has a circumference of 12.56 inches.

we know that

$p = 2\pi \times r \\ 12.56 = 2\pi \times r \\ r = \frac{12.56}{2 \times 3.14} \\ r = 2$

ring's radius is 2 inch