Draw a circle. Measure its radius. Calculate its diameter, circumference, and area.
The circular frame of a dream catcher has diameter 10 cm.
a) How much wire is needed to make the outside frame?
b) What is the area enclosed by the frame of this dream catcher?
Find the area. Show your work.
Find the area. Show your work.
A goat is tied to an 8-m rope in a field.
a) What area of the field can the goat graze?
b) What is the circumference of the area in part a?
Choose a radius. Draw a circle. Suppose you divide the radius by 2.
a) What happens to the circumference?
b) Explain what happens to the area.
The diameter of a circular mirror is 28.5 cm. What is the area of the mirror?
Give the answer to two decimal places.
Suppose you were to paint inside each shape below. Which shape would require the most paint? How did you find out?
Po Ling is planning to pour a concrete patio beside her house. It has the shape of a triangle. The contractor charges $125.00 for each square metre of patio. What will the contractor charge for the patio?
Find the radius of a circle with a diameter of 12m.
Find the radius of a circle with a diameter of 20cm.
Find the radius of a circle with a diameter of 7cm.
Find the diameter of a circle with a radius of 15cm.
Find the diameter of a circle with a radius of 22cm.
Find the diameter of a circle with a radius of 4.2cm.
A circular pool has a circular concrete patio around it.
a) What is the circumference of the pool?
b) What is the combined radius of the pool and patio?
c) What is the circumference of the outside edge of the patio?
