This answer key provides the correct radius and diameter measurements for the twelve circle geometry problems shown in the worksheet.

Let’s go through each problem one by one. Remember:

- The radius is the distance from the center of the circle to the edge.
- The diameter is the distance across the circle, passing through the center — it’s always twice the radius.
- So:
→ If you’re given the radius, multiply by 2 to get the diameter.
→ If you’re given the diameter, divide by 2 to get the radius.

Also, don’t forget to keep the same units (like ft, in, yd) in your answer!

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Problem 1:
Given: Radius = 3 yd
→ Diameter = 3 × 2 = 6 yd

Problem 2:
Given: Diameter = 92 in
→ Radius = 92 ÷ 2 = 46 in

Problem 3:
Given: Radius = 23 ft
→ Diameter = 23 × 2 = 46 ft

Problem 4:
Given: Diameter = 36 in
→ Radius = 36 ÷ 2 = 18 in

Problem 5:
Given: Radius = 19 ft
→ Diameter = 19 × 2 = 38 ft

Problem 6:
Given: Diameter = 12 yd
→ Radius = 12 ÷ 2 = 6 yd

Problem 7:
Given: Radius = 60 ft
→ Diameter = 60 × 2 = 120 ft

Problem 8:
Given: Diameter = 108 yd
→ Radius = 108 ÷ 2 = 54 yd

Problem 9:
Given: Diameter = 6 ft
→ Radius = 6 ÷ 2 = 3 ft

Problem 10:
Given: Diameter = 60 yd
→ Radius = 60 ÷ 2 = 30 yd

Problem 11:
Given: Radius = 35 ft
→ Diameter = 35 × 2 = 70 ft

Problem 12:
Given: Diameter = 10 in
→ Radius = 10 ÷ 2 = 5 in

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Final Answer:
1) Radius = 3 yd, Diameter = 6 yd
2) Radius = 46 in, Diameter = 92 in
3) Radius = 23 ft, Diameter = 46 ft
4) Radius = 18 in, Diameter = 36 in
5) Radius = 19 ft, Diameter = 38 ft
6) Radius = 6 yd, Diameter = 12 yd
7) Radius = 60 ft, Diameter = 120 ft
8) Radius = 54 yd, Diameter = 108 yd
9) Radius = 3 ft, Diameter = 6 ft
10) Radius = 30 yd, Diameter = 60 yd
11) Radius = 35 ft, Diameter = 70 ft
12) Radius = 5 in, Diameter = 10 in