a. if u unfold a cylinder, it is a circle, a rectangle, and a circle. Find the area of those to find the area of the circle, you need the radius.: 14/2= 7 To find the area of a circle, it is 3.14*r^2 =3.14*49 = 1538.6 Now you have to multiply it by 2 because there are two circles: 3077.2
Now find the area of the rectangle: To find the area, you have to have the height (20cm) and the width of the rectangle/the circumference of the circle. To find the circumference: 2*3.14*r(7) = 2*3.14*7 =43.96 Now that you have that, you can find the area 43.96*20 =879.2
Now you add both products together 879.2+ 3077.2 =3956.4cm^2
B. divide 3956.4 by 3 =$1318.8
C. volume of cylinder: 3.14*r(7)^2h(20) calculate that you get 3077.2
Hope that helps, and please notify me if I am wrong.
