1. Which of the equations below could be used to find the radius of a dinner plate whose area is 255 square inches?

255 = r2

255 =

255 = 2 r

2. Which of the following is the best approximation of the area of a circle whose diameter is 14 feet?

44 square feet

88 square feet

154 square feet

616 square feet

3. The spray from a sprinkler creates a circle with a radius of 15 feet. Which of the following is the best approximation of how many square feet of grass the sprinkler covers?

47

94

225

707

Question

Mathematics

Aaliyah Knight

22 March, 04:44

1. Which of the equations below could be used to find the radius of a dinner plate whose area is 255 square inches?

255 = r2

255 =

255 = 2 r

2. Which of the following is the best approximation of the area of a circle whose diameter is 14 feet?

44 square feet

88 square feet

154 square feet

616 square feet

3. The spray from a sprinkler creates a circle with a radius of 15 feet. Which of the following is the best approximation of how many square feet of grass the sprinkler covers?

47

94

225

707

+1

Answers (2)

Know the Answer?

Helena Miranda · Answer 1

I'm not 100% sure but I think #2 is B and #3 is D but if im wrong Im so sorry

Shiloh Rios · Answer 2

1.

S=πr² ⇒ 255=πr²

2.

d=14 feet

r=d/2 = 14/2 = 7 feet

S = πr² = 3.14 * 7² = 3.14 * 49 ≈ 154 square feet

3.

S = πr² = 3.14 * 15² = 3.14 * 225 ≈ 707 square feet.