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Calculate the perimeter of a sector of a circle of radius 12cm and angle 60°

• (12 + 6π)cm
• (12 + 4π)cm
• (24 + 6π)cm
• (24 + 4π)cm

QUICK ANSWER…

D

SOLUTION…  

The perimeter of any shape is the total length of all the sides of the shape. That is, assuming a shape is stretched to form a straight line, the length of this line is called the perimeter of the shape.

For this question, we have a sketch:

Now for the right answer to the above question:

1. Option A is incorrect.
2. Option B is incorrect.
3. C is incorrect.
4. D is the correct answer.

QUICK TIPS…

You may please note these/this:

• Always remember that the perimeter of any shape is the total length of its outline.
• Perimeter of a sector of a circle = L + 2R. Where L = length of arc AB, and R = radius of circle.

You are free to add your own answers below this page to assist others improve their learning.

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/ culled from 2016 JAMB-UTME mathematics past question 18 /