Need help with this trigonometry word problem
The angle of elevation of the top of the building at a distance of 50 m from its foot on a horizontal plane is found to be 60°. Find the height of the building.
Please show your work

Respuesta :

Nayefx

Answer:

[tex] \huge \boxed{ \boxed{ 50 \sqrt{3} \: or \: 86.6}}[/tex]

Step-by-step explanation:

to understand this

you need to know about:

  • trigonometry
  • PEMDAS

let's solve:

to find the height we need to use tan function because we are given adjacent and angle and we need to figure out opposite (height) [tex]\tan(\theta)=\dfrac{opposite}{adjacent}[/tex]

let opposite be AC

let adjacent be BC

according to the question:

[tex] \quad \: \tan( {60}^{ \circ} ) = \dfrac{AC}{BC} [/tex]

now we need a little bit algebra to figure out AC (height)

  1. [tex] \sf \: substitute \: the \: given\: value \: of \: BC : \\ \tan( {60}^{ \circ} ) = \frac{AC}{50} [/tex]
  2. [tex] \sf sustitute \: the \: value \: of \: \tan( {60}^{ \circ} ) \: i.e \: \sqrt{3} : \\ \sqrt{3 } = \frac{AC }{50} [/tex]
  3. [tex] \sf cross \: multiplication: \\ 50 \sqrt{3} = AC[/tex]
  4. [tex] \sf swap \: sides \: (your \: wil) : \\ AC = 50 \sqrt{3} \\AC = 86.6 \: ( \sf \: decimal \: if\: needed)[/tex]

[tex]\text{we are done!}[/tex]

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