Question

help me

Answer 1

The length of the shadow of a building is 90 meters, as shown below:

What is the height of the building?

180 m

51.96 m

155.88 m

60 m

i know i have to find the adjacent i believe but i just need someone to guide me

Answer 2

@jim_thompson5910

Answer 3

\[\Huge \tan \theta = \frac{perpendicular}{base}\]

Answer 4

and all you need to know is that \[\Huge \tan 30 = \frac{1}{\sqrt 3}\]

Answer 5

i did something similar with someone earlier so i think it should be easy for me to understand

Answer 6

okay let me solve it

Answer 7

\[\Huge \frac{1}{\sqrt 3 } = \frac{H}{90}\]
Solve for H.

Answer 8

cross multiply?

Answer 9

yep then divide both sides by root 3

Answer 10

52?

Answer 11

what did you do? H should be
\[\Huge H=\frac{90}{ \sqrt 3}\]

Answer 12

to change the form,
\[\LARGE H = \frac{90}{\sqrt 3} \times \frac{\sqrt 3}{\sqrt 3} = 30 \sqrt 3\]

Answer 13

i know then i get 52?

Answer 14

i got 51.96 and i rounded

Answer 15

http://www.wolframalpha.com/input/?i=30%E2%88%9A3

Answer 16

oh..u wrote an exact answer so I thought u did smt wrong XD its okay

Answer 17

i submitted it and got 100% thanks for all the help

Answer 18

uw