A square pyramid has base side 8 cm and each triangular face has slant height 5 cm. Find the total e

Question

A square pyramid has base side 8 cm and each triangular face has slant height 5 cm. Find the total exposed surface area, using $\pi=3.142$ where needed. Give decimal answers to 2 d.p. $5\text{ cm}$ Base side 8 cm Face

Accepted Answer

Base area $=8^2=64\text{ cm}^2$. Four triangular faces have area $4\left(\dfrac12\right)(8)(5)=80\text{ cm}^2$. Total area $=64+80=144\text{ cm}^2$.

Exposed surface area

Exposed surface area

Solution:

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