Cos (180) = - 1
I just plugged it into a calculator.
We know that, In a Right Angled Triangle :
✿ (Hypotenuse)² = (First Leg)² + (Second Leg)²
From the Diagram :
✿ Hypotenuse = x
✿ First Leg 
✿ Second Leg 




X^2=2y
To get x on its own you would have to square root both sides so you would end up with:
x=sqrt(2y)
Answer:
132 cm^2
Step-by-step explanation:
7x4 is 28 for the top rectangle.
Bottom left triangle is bh/2 which here is 8x6/2 which is 24.
The same goes for the bottom right triangle.
Lastly the middle triangle is 7*8 which is 56.
Hence, 56+28+24+24=132!
Hope it helped!
Given:
Radius of a cylinder = 5 units.
Surface area of the cylinder = 
To find:
The height of the right cylinder.
Solution:
Surface area of a cylinder is:

Where, r is radius and h is the height of the cylinder.
Putting
in the above formula, we get



Subtract
from both sides.


Divide both sides by
.


Therefore, the height of the cylinder is 11 units.