The points $A$, $B$ and $C$ are on level ground and a flag pole is placed at point $A$ with

Question

The points $A$, $B$ and $C$ are on level ground and a flag pole is placed at point $A$ with the tip of the pole at $D$. Given that the distance of $AB=80$ m, $AC=39$ m and $BC=74$ m. Calculate the $\angle BAC$, the area of $ABC$, the height of the flag pole if the angle of elevation of the top of the flag pole when viewed from $B$ is $4{}^\circ$.

Accepted Answer

(i) $\angle BAC=66.9^\circ$ (ii) $1440\text{ m}^2$ (iii) $5.59\text{ m}$

3-Dimensional Problem

3-Dimensional Problem

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