Can anyone find the answer?

A≈351.86 or rounded to the nearest tenth, 351.9.

Your answer should be A.

Step-by-step explanation:

To begin, you must acknowledge the formula for the SA or Surface Area of a Cylinder. Which is: 2πrh+2πr2

Now, we plug it in!

2π4×10 + 2π16

How do I know this?

Your radius if 4, since it's half of the cylinder. Since the second part calls for your radius squared, you must do 4x4.

geometry: triangles

solvers

lessons

answers archive

call the larger triangle abc

then the smaller triangle cde is similar to abc (all angles are equal, aaa).  

ab is the side that is 36, and we wish to find de, the side corresponding to ab

area_cde = area_abc - area_cde --> area_abc / area_cde = 2

let x=length of de

ratio of areas = (ratio of sides)^2

+2+=+%2836%2fx%29%5e2+

+2+=+1296%2fx%5e2+

++x%5e2+=+1296%2f2+=+648+

25.45584