What is the radius of the incircle of a regular hexagon with a side of 20 cm?

Question

Mathematics

Kennedi Wiley

4 July, 08:33

What is the radius of the incircle of a regular hexagon with a side of 20 cm?

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Answers (1)

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Heather Rush · Answer 1

10√3 cm.

The radius of an incircle of a hexagon is the same measure as the apothem. find the apothem by taking half of the central angle and create a right triangle perpendicular to the side. The central angle is 60 so the angle opposite the side length will be 30. this creates a 30-60-90 triangle with the ratio x:x√3:2x. half the side opposite 30 is 10, so x=10. the base angle of the side is 60 so it will be x√3. plug in 10 for x to get 10√3 cm.