Question

From the bank of a river the top of a building just on the opposite bank is observed to have an angle of elevation of 45 degree .On walking 50 m..from the bank perpendicular to its edge the angle of elevation of its top becomes 30 degree .Find the height of the building.

Answer 1

Answer:

25m

Step-by-step explanation:

form figure

$\tan(45) = 1$

: 1

$1 = y \div 50$

$= 50$

from second one.

$\sin(30) = 1 \div 2$

$1 \div 2 = x \div 50$

$x = 50 \div 2$

$x = 25m$