Question

Question
1
Question
2
Question
3
Question
4
cm
A)
If the radius of a circle is 7 cm, then what is the circumference? Round to the nearest whole number.
(1 point)
A)
If the circumference of a circle is 20
, then how long is the diameter?
(1 point) π
The circumference is
inches.
A)
If a radius is
inch, then what is the circumference of the circle rounded to the nearest tenths place?
(1 point)
1
4
A)
If a circular table is 6 feet across the middle, approximately how much fabric would be needed tocover the top of the table? Round to the nearest square foot.
(1 point)
ft.2
Question
5
cm
A)
If the area of a circle is
, then what is the length of the diameter? Round to the nearestwhole number.
(1 point)
372 cm2

Answer 1

1) r = 7 cm. C = 2πr = 14π ≈ 43.98 → 44 cm.

2) If C = 20π, then C = πd ⇒ d = 20 → 20 inches.

3) r = 1/4 in. C = 2π(1/4) = π/2 ≈ 1.5708 → 1.6 in (to the nearest tenth).

4) Table diameter = 6 ft ⇒ r = 3 ft. Area = πr^2 = 9π ≈ 28.27 → 28 ft².

5) A = 372 cm². d = 2·√(A/π) = 2·√(372/π) ≈ 21.77 → 22 cm.