Circle ~ Circumference
Q1. Calculate the circumference of the circles below :
a. b. c. d.
Q2. Calculate the circumference of circles with diameter :
a. 10 cm b. 20 cm c. 100 mm d. 8 cm
e. 25 mm f. 30 cm g. 500 mm h. 60 m
i. 16 mm j. 15 cm k. 50 cm l. 200cm
Q3. Write down the diameter of circles with radius :
a. 4 cm b. 5 cm c. 15 cm d. 9 mm
e. 10 m f. 14 cm g. 3 m h. 12mm
i. 8 cm j. 25 mm k. 1.5 m l. 24 cm
Q4. Calculate the circumference of circles with radius :
a. 10 cm b. 15 cm c. 50 cm d. 30mm
e. 3 m f. 5 m g. 4 m h. 20 cm
i. 2 m j. 12 cm k. 25 cm l. 100cm
Q5. Patricia wants to put a decorative edge round the top and bottom
of the wastepaper bin in her bedroom.
The top of the bin has a diameter of 25 cm and the bottom has
a diameter of 20 cm.
What length of edging will she need to buy ?
Q6. Martin has to replace the circular seal in the door of his
washing machine.
The radius of the door is 12 cm.
What is the circumference if the door seal ?
Circle ~ Area
Q1. Calculate the area of circles with radius :
a. 10 cm b. 20 cm c. 100 mm d. 8 cm
e. 25 mm f. 30 cm g. 500 mm h. 60 m
i. 16 mm j. 15 cm k. 50 cm l. 200cm
Q2. Write down the radius of circles with diameter :
a. 4 cm b. 5 cm c. 15 cm d. 9 mm
e. 10 m f. 14 cm g. 3 m h. 12mm
i. 8 cm j. 0.5 mm k. 1.6 m l. 2.5 cm
Q3. Calculate the area of circles with diameter :
a. 10 cm b. 16 cm c. 50 cm d. 30mm
e. 2 m f. 12 m g. 4 m h. 20 cm
i. 3 m j. 5 cm k. 25 cm l. 100cm
Q4. Calculate the area of the circles below :
a. b. c. d.
Q5. Simon is cutting a circular area from his lawn
to plant a rose-bed.
If the diameter of the rose-bed is 1m, what
area of lawn will he need to remove ?
ANSWERS
Circle ~ Circumference
Q1. a. 31.4 cm b. 43.96 cm c. 18.84 cm d. 125.6 cm
Q2. a. 31.4 cm b. 62.8 cm c. 314 mm d. 25.12 cm
e. 78.5 mm f. 94.2 cm g. 1570 mm h. 188.4 m
i. 50.24 mm j. 47.1 cm k. 157 cm l. 628 cm
Q3. a. 8 cm b. 10 cm c. 30 cm d. 18 mm
e. 20 m f. 28 cm g. 6 m h. 24 mm
i. 16 cm j. 50 mm k. 3 m l. 48 cm
Q4. a. 62.8 cm b. 94.2 cm c. 314 cm d. 188.4 mm
e. 18.84 m f. 31.4 m g. 25.12 m h. 125.6 cm
i. 12.56 m j. 75.36 cm k. 157 cm l. 628 cm
Q5. 78.5 cm + 62.8 cm = 141.3 cm
Q6. 75.36 cm
Circle ~ Area
Q1. a. 314 cm2 b. 1256 cm2 c. 31400 mm2 d. 200.96 cm2
e. 1962.5 mm2 f. 2826 cm2 g. 78500 mm2 h. 11304 m2
i. 803.84 mm2 j. 706.5 cm2 k. 7850 cm2 l. 125600 cm2
Q2. a. 2 cm b. 2.5 cm c. 7.5 mm d. 4.5 cm
e. 5 m f. 7 cm g. 1.5 m h. 6 mm
i. 4 cm j. 0.25 mm k. 0.8 m l. 1.25 cm
Q3. a. 78.5 cm2 b. 200.96 cm2 c. 1962.5 cm2 d. 706.5 mm2
e. 3.14 m2 f. 113.04 m2 g. 12.56 m2 h. 314 cm2
i. 7.065 m2 j. 19.625 cm2 k. 490.625 cm2 l. 7850 cm2
Q4. a. 7.065 cm2 b. 78.5 cm2 c. 0.785 cm2 d. 314 cm2
Q5. 0.785 m2 Q6. 314 cm2