Question

for questions 13 and 14, refer to the figure. The angle of elevation from the end of the shadow to the top of the building id 70 degrees and the distance is 180 feet.

first question is asking to find the height of the building to the nearest foot.

Answer 1

@Mertsj

Answer 2

We need to use right triangle trig.
Which ratio is the oppostie leg over the hypotenuse? @frogs29

Answer 3

sin

Answer 4

Yes.

sin 70° = h/180 where h is the height of the building.

Answer 5

alright

Answer 6

sin 70° = h/180
h = 180 * (sin 70° )
h = ? @frogs29

Answer 7

ummm 12,600?

Answer 8

@Directrix

Answer 9

Let me see what I get.

Answer 10

>>>ummm 12,600? No.

Is your calculator set to degrees? @frogs29

Answer 11

What is sine of 70 degrees?

Answer 12

no and im not sure

Answer 13

Go to Google.com and enter this in the search box:

"sine of 70 degrees"

The Google calculator will toss back the sine of 70 degrees and you can post that result here.

Answer 14

0.93969262078

Answer 15

Okay. Multiply that by 180 and post what you get.

Answer 16

169.144672

Answer 17

Correct. Look at the instructions to see if you are supposed to round the answer.

Answer 18

round to the nearest foot
so its just 169 foot

Answer 19

I agree.

Answer 20

so now i have to find the length of the shadow to the nearest foot

Answer 21

cos 70 degrees = y/180 where y is the shadow length

Answer 22

okay so how do i start it?

Answer 23

cos 70° = y/180

y = 180 * cos(70°)

Find cosine of 70 degrees by entering "cosine of 70 degrees" into the Google search box.

Post what it throws back.

Answer 24

oh ok

Answer 25

so its62?

Answer 26

Yes, I got 62 for the shadow when I rounded up.

Answer 27

alright thank you so much!!

Answer 28

You are welcome.