Question

find the surface area of the cylinder with radius 4 and height 10

Answer 1

Think of it as a net, with the rectangular " middle part" and the two cross-sections, the sum of the surface areas of these three = total surface area of the cylinder

Answer 2

the sum of the surface areas of the cross-sections are 2(pi x radius x radius) = 2(3.14 x 4 x)

Answer 3

2( 3.14 x 4 x 4) *

Answer 4

these are the answer a) 276.32 units²

b) 351.68 units²

c) 502.4 units²

d) 3140 units

Answer 5

We know that the height of the rectangle is 10. The base is equal to the circumference of the circular cross-sections, eg. 3.14 x 8, ( being the diameter), so the area of the rectangular section is 10(3.14 x 8), or 3.14x 80. Add the results together; 2(3.14 x 4 x 4) + (3.14 x 80) = total surface area

Answer 6

b is the answer.

Answer 7

Yes

Answer 8

thanks

Answer 9

can you help me with this one please
Find the surface area of a cone with radius 5 and slant height 8.