Question

A farmer is estimating the surface area of his barn to find how much paint he needs to buy. One part of the barn is triangular as shown.






a. The darkened sides in the figure are the edges of the roof. This trim will be painted white. Find the length of each of these two sides of the triangle. Explain how you found the answer.

b. The triangular surface will be painted red. Find the area of the triangle. Explain how you found the answer.

Answer 1

Divide the triangle into two right angle triangles of 11m

Answer 2

then cos(30)=A/H,
so cos(30) is 11/H,
find value of cos(30), then solve for h.

Answer 3

(Use the exact value for cos(30)

Answer 4

Can Please give me the answer ?

Answer 5

@peanutman

Answer 6

cos (30) is sqrt3/2,
so sqrt3/2 is 11/H
now solve for H, and you will have the length of the side.

Answer 7

12.7 @peanutman

Answer 8

u can leave it as a fraction.

Answer 9

how can i do that

Answer 10

sqrt 3/2 = 11/H
therefore:
H times sqrt 3/2 = 11
therefore,
H = 11/sqrt3/2
=22/sqrt3

Answer 11

thats the answer

Answer 12

for the length of the side. and add the unit

Answer 13

whats the unit

Answer 14

m

Answer 15

i dont get it can you please give me the answer

Answer 16

do you know how to do cos?

Answer 17

no

Answer 18

ok, cos gives you the length of one side when you have the length of one other side and the angle of the triangle.

Answer 19

how can i get the answer

Answer 20

its what i said above.

Answer 21

22/sqrt3m

Answer 22

m for metre

Answer 23

go to mathsisfun.com and try to understand cos. it's very helpful for questions like this.

Answer 24

can give me the answer from where u started please im lost

Answer 25

ill try. tell me when you lose me.

Answer 26

we start with the triangle in the pictire