Answer: 
Step-by-step explanation:
The first step is to make the division of the fractions
and
. To do this, you can flip the fraction
over and multiply the numerators and the denominators of the fractions. Then:

Reduce the fraction
:

Now you can make the subtraction: in this case the Least Common Denominator (LCD) will be the multiplication of the denominators. Divide each denominator by the LCD and multiply this quotient by the corresponding numerator and then subtract the products. Therefore you get:

Triangle D
Because the Pythagorean Theorem is only used with a RIGHT triangle
Hard to awnser a question if i cant understand what you are saying
Whole formula 2*pi*radius^2 + 2*pi*radius*height:
157+942= 1099
SA= 1099