The diameter of a circle is the distance from the centre of the circle to any point on the circle?
Units of area are always written as squares for e.g. mm 2, cm 2, m 2 e.t.c.
Find the area of a circle with a diameter of 20 cm. Give the answer correct to 1 decimal point (DP).
A = 341.2 cm 2
A = 314.2 cm 2
A = 342 cm
A = 100c m 2
Find the area of a circle with a radius of 12 cm. Give your answer correct to 3 significant figures (SF).
A = 452 cm 2
A = 453 cm 2
A = 452 cm
A = 453 cm
Find the area of a circle with a diameter of 12 m. Give the answer correct to 1 decimal place (DP).
A = 36.1 m 2
A = 36 m
A = 113.0 m 2
A = 113.1 m 2
Find the area of a circle with a radius of 50 mm. Give your answer correct to 4 significant figures (SF).
A = 7853 mm 2
A = 7854 mm 2
A = 2500 mm 2
A =2500 mm
To find the area of a semi-circle you can use the following formula: 1/2 x π x r 2
Find the circumference of a wheel with a diameter of 50 cm. Give your answer correct to 4 significant figures (SF).
C = 175cm
C = 150cm
C = 157 cm 2
C = 157 cm
A plate has a radius of 15 cm. Find the circumference of the plate and give your answer correct to 1 decimal place (dp)
C = 94.1 cm
C = 49.2 cm
C = 94.2 cm
C = 94.2 m
A wheel has a radius of 300 mm. Find the circumference of the wheel and give your answer correct (to 4 SF)
C = 1488 mm
C = 1884 mm
C = 1885 mm
C = 600 mm
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