Question

A ladder 10 metres long reaches to a 10 metres from the top of flag - staff. At the foot of the ladder, the elevation of the top of flag - staff is 60°. Find the height of flag - staff.​

Answer 1

$cd = ad = 10m \\ acd \: is \: isosceles \: triangle \\ cab = 60 \\ acb = cad = 30 \\ bad = 30 \\ \\ in \: . \: abd \\ \sin(30) = \frac{bd}{ad} \\ bd = ad \\ \sin(30) = 4.5 \\ bc = bc + dc \\ = 4.5 + 10 = 4.15 \\ \\ idk \: if \: its \: right \: or \: not \\ social \: worker$

${ \huge\rm \pink {♡H}\rm \blue {A} \rm \purple {N}\ \rm \green{J} \rm\red {U}\ \rm \orange {H} \rm{U} \rm \gray{I♡}}$