HKDSE-MATH - 2021 - Paper 2

Note that the regular $6$-sided polygon can be divide

Let $r_1\text{ cm}$ and $r_2\text{ cm}$ be the radius

I is true. Let $r\text{ cm}$ be the radius of the sector

Since $\mathrm{\Delta }EBF\sim \mathrm{\Delta }DAE$, then we have

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