Answer:
40
Step-by-step explanation:
You can split it down the middle to form 2 right triangles. Then, use the rules of sin, cosin, and tan to figure out the length of the sides.
You have the bottom side is 9 (because you split the original triangle in half, so 18/2 = 9) and that the angle next to that side is 35. You are trying to find the hypotenuse because that will help you find the perimeter.
You can use cosin(angle) = adjacent/hypotenuse
you have:
angle = 35
adjacent = 9
hypotenuse = unknown, call it x
So you can plug those values into your equation and you would have:
cosin(35) = 9/x
Rearranging the terms, you have:
x = 9/cosin(35)
Put this in a calculator and you will get x = about 11
To find the perimeter, just do 11 + 11 + 18 = 40 feet
