Question

A regular octagon is inscribed in a circle with the radius of 5cm. Find the area of the octagon.

Answer 1

The octagon is made up of 8 equi ∆s. And the side of each equi ∆ is 5 cm (rad of circle). \[Area=8 \times \frac{1}{2} \times 5 \times 5 \times [\sin 60˚] = 50\sqrt{3}\]

Answer 2

Will the triangles be drawn from one point on the octagon to the others? or each point to the middle