The length of a string between a kite and a point on the ground is 85m. If the string makes an angle θ with the level ground such that tan θ = 15/8,how high is the kite?
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let OX be the horizontal ground and Let A be the position of the kite. Let O be the position of the observe and OA be the string. Draw AN perpendicular OX.
Then,
/_ BOA = ¢ Such that Tan ¢ = 15/8
And,
OA = 85 m , /_ OBA = 90°.
Let AB = h metres
From right ∆ OBA , we have
Tan ¢ = 15/8 = Perpendicular / Base.
Perpendicular = 15 and Base = 8
By Pythagoras theroem,
( Hypotenuse )² = ( Base)² + ( Perpendicular)²
( H )² = (8)² + (15)²
H = √289 = 17 m
Therefore,
Sin ¢ = Perpendicular / Hypotenuse
Sin ¢ = 15/17
15/17 = Sin ¢ [ Since Tan ¢ = 15/8 =>Sin ¢ = 15/17]
=> h / 85 = 15/17
=> h = 15/17 × 85
=> h = 75 m.
Hence,
The Height of the kite from the ground is 75 m.
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