Primary 6 · Circle · Question type 6.1
A circle's edge is a little more than 3 diameters long when rolled out flat. That number of diameters is π.
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Primary 6, on the MOE Primary Mathematics syllabus.
The lesson · 2 minutes 17 seconds
Watch: the circumference of a circle with a radius of 5 cm
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A complete lap follows the circle's circumference.
A school field has a painted circle of radius 25 m. Wei Ting jogs one complete lap around it. How far does she jog? (Take π = 3.14.)
Ans: 157 m
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Next, find the area inside a circle. Area of a Circle →