Just for Fun
How many corners does a circle have?
None!
What is the formula for the circumference of a circle?
C = 2πr or πd
If the radius is 4cm, what is the area of the circle?
50.24cm2
Name a real-life object shaped like a circle.
Wheel, plate, clock, etc
How many times does the radius fit into the circumference of a circle?
2π≈6.28
How many edges does a circle have?
None!
What is the formula for the area of a circle?
A=πr2
A circular tablecloth has a radius of 3m. What is its area?
28.26m2
What is the approximate value of π (pi) to two decimal places?
3.14
If the radius is 10cm, what is the area of the circle?
314cm2
What do you call a circle that is perfectly sliced in half?
Semicircle
What do you call the distance across a circle through its center?
Diameter
A bike tire has a diameter of 0.7m. What is its circumference?
2.2m
A pizza has a diameter of 12 inches. What is its radius?
6 inches
A circle has a circumference of 50.24 cm. What is its diameter?
16 cm
Why is π called "pi"?
If the radius is 5cm, what is the diameter?
10cm
If a circular swimming pool has a circumference of 31.4m, what is its radius?
5m
A circular pond has a diameter of 20 meters. What is its circumference?
62.8m
A circle has an area of 78.5cm2. What is its radius?
5cm
Which famous day is dedicated to the number π ?
Pi Day (March 14th, 3/14)
If the diameter is 14cm, what is the radius?
7cm
A clock face has a radius of 15cm. What is its area?
706.5cm2
A wheel has a radius of 0.5 meters. How far does it roll in one full rotation?
3.14m
A frisbee has a radius of 8cm. What is its area?
201.06cm2