Math 2017 Question 44
Question 44
A circle of radius 21cm is shown below
(a) Calculate the circumference of the circle. (2 marks)
(b) The circle is cut into 8 equal parts as shown below
The parts are used to form the shape below.
Calculate the perimeter of the shape. (3 marks)
Answer
(a) 132 cm
(b) 174 cm
Explanation
(a) Perimeter of circle=22 ⁄7 ×2×21 = 132 cm
(b) Perimeter of shape = Perimeter of circle + radius + radius = 132 + 21 + 21 = 174 cm
Check the link below to see a detailed lesson on circumference, diameter and radius of circles
