Circumference of a circle and area of a disc
Answers are for parents and teachers.
1
Find the circumference of a circle with radius 5 cm (π = 3.14).
31.4 cm
2
What is the area of a disc with radius 1 cm? Give the answer in terms of π.
π cm² (≈ 3.14 cm²)
3
A circle has circumference 12.56 cm. Find its radius (π = 3.14).
2 cm
4
Find the area of a round field with radius 20 m (π = 3.14), in m².
1256
5
A bicycle wheel has diameter 70 cm. About how many cm does the bicycle travel in one full turn of the wheel (π = 3.14)?
219.8 cm