Question

Two chimneys 18 m and 13 m high stand upright in a ground. If their feet are 12 m apart,then the distance between their tops is:

• A. 5 m
• B. 31 m
• C. 13 m
• D. 18 m

Answer 1

The correct option is C 13 m

We have to find AC.
$A{C}^2=A{B}^2+B{C}^2$ ($\because \Delta ABC$ is right $\Delta$ le)
$A{C}^2=5^2+{12}^2$
$=25+144=169$
$AC=\sqrt{169}=13m$.