To find a volume of a cylinder we use the following formula:

Plug in the values:

Take the square:

Multiply the numbers:
Area of a triangle is calculated by using the formula A=1/2bh
A= 1/2 (8.2) (5)
A=1/2 (41)
A=20.5 or 20 1/2, whichever way you think your teacher wants it.
The answer is B. CD=KL, DE=LM, EF=MN, and so on
Z° + 43° = 180°-------(linear angles)
z° = 180 - 43°
z = 137°
Hope this helps.