Free Area and circumference PDF Worksheets & Answers
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Explanation:
For any circle with radius r and diameter d = 2r: the Circumference (perimeter) is C = πd (or 2πr), and the Area is A = πr². Always check whether the question gives you the radius or the diameter before starting!
If the question asks for your answer in terms of π (non-calculator), leave π as a symbol in your answer (e.g. 25π cm²). Remember that the perimeter of a semicircle includes the straight diameter as well as the curved arc: Perimeter = 12πd + d.
Example 1: A circle has a diameter of 12 cm. Work out its area and circumference to 1 d.p.
Example 2: Work out the perimeter of a semicircle with radius 5 cm. Give your answer to 1 d.p.
GCSE Past Paper Area and circumference Questions & Answers
Worked Solution & Mark Scheme (3 marks)
AC is the diameter of semicircle X and B is the centre of semicircle X
BD is the diameter of semicircle Y and C is the centre of semicircle Y
CE is the diameter of semicircle Z and D is the centre of semicircle Z
AC = BD = CE = 20 cm
Work out the perimeter of the shaded shape.
Give your answer correct to the nearest whole number.
Worked Solution & Mark Scheme (3 marks)
Straight segments AB = 10 cm and DE = 10 cm M1
Perimeter = 3 × 10π + 10 + 10 = 30π + 20 = 114.247... ≈ 114 cm. A1