Let’s solve each part step by step. Remember:
- The
radius is half the diameter.
- The
diameter is twice the radius.
- 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.
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a. Given: radius = 5 mm
→ diameter = 5 × 2 =
10 mm
b. Given: diameter = 18 cm
→ radius = 18 ÷ 2 =
9 cm
c. Given: radius = 3 m
→ diameter = 3 × 2 =
6 m
d. Given: diameter = 14 km
→ radius = 14 ÷ 2 =
7 km
e. Given: radius = 11 m
→ diameter = 11 × 2 =
22 m
f. Given: diameter = 20 ft
→ radius = 20 ÷ 2 =
10 ft
g. Given: diameter = 26 km
→ radius = 26 ÷ 2 =
13 km
h. Given: radius = 5 cm
→ diameter = 5 × 2 =
10 cm
i. Given: diameter = 18 km
→ radius = 18 ÷ 2 =
9 km
j. Given: radius = 1 m
→ diameter = 1 × 2 =
2 m
k. Given: radius = 12 cm
→ diameter = 12 × 2 =
24 cm
l. Given: diameter = 40 mm
→ radius = 40 ÷ 2 =
20 mm
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m. John has a round swimming pool. The distance from the center to the edge (that’s the
radius) is 3 meters.
We need the
diameter.
→ diameter = 3 × 2 =
6 meters
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Final Answer:
a. radius = 5 mm, diameter = 10 mm
b. radius = 9 cm, diameter = 18 cm
c. radius = 3 m, diameter = 6 m
d. radius = 7 km, diameter = 14 km
e. radius = 11 m, diameter = 22 m
f. radius = 10 ft, diameter = 20 ft
g. radius = 13 km, diameter = 26 km
h. radius = 5 cm, diameter = 10 cm
i. radius = 9 km, diameter = 18 km
j. radius = 1 m, diameter = 2 m
k. radius = 12 cm, diameter = 24 cm
l. radius = 20 mm, diameter = 40 mm
m. answer: 6 meters
Parent Tip: Review the logic above to help your child master the concept of circle circumference worksheet answers.
