Cambridge Maths Academy

수학 모음 (Maths collection) 전체보기 1. Area of a regular octagon Question. Find the area of a regular octagon with side length $a$. (4-9 Higher GCSE by Michael White, Ch13 Geometry 4, p.426 Q19.) We consider the area of the triangle with an angle $\theta$ subtended at the centre. $$ \begin{align} \theta=\frac{360}{8}=45^\circ \end{align} $$ The height $h$ of the triangle is given by $$ \begin{align} \..