Question

A building 15 m high cast a shadow 1.8 m long
Then what is the height of the pole casting the shadow same time 6 m long
Pls pls answer fast.

Answer 1

15÷1.8=x÷6
x=(15×6)÷1.8
x=50
height of pole is 50 m

Answer 2

height
$height = x$
$formula = h {}^{2} = b {}^{2} + p {}^{2}$

$15 {}^{2} = 6 {}^{2} + p {}^{2}$
$225 = 36 + p {}^{2}$
$p {}^{2} = 225 - 36$
$p { }^{2} = 189$