Question

Please help im so stuck on this !!!!!!!!n

Answer 1

Explanation:

4) d = 12 cm; r = 12/2 = 6cm ; h = 5 cm

S.A = 2πr(r + h)

= 2* 3.14 * 6 * (6 + 5)

= 2 * 3.14 * 6 *11

= 414.48 cm²

5) d = 8 cm ; r = 8/2 = 4cm ; h = 7cm

S.A = 2πr(r + h)

= 2 *3.14 * 4 * (4 + 7)

= 2 * 3.14 * 4 * 11

= 276.32 cm²

6) r = 4 cm ; h = 6cm

SA = 2πr(r +h)

= 2 * 3.14 * 4 * 10

= 251.2 cm²

7) Area of front and back =
`2*(1)/(2)*base * height`

= base * height

SA = (front and back) + Base + left + right

= 4* 3 + (8*3) + (8*4) + ( 8*5)

= 12 + 24 + 32 + 40

= 108 cm²

8) SA = (front and back) + Base + left + right

= (8 * 6) + (12*6) + (12*8) + (12*10)

= 48 + 72 + 96 + 120

= 336 cm²

9) SA = (front and back) + Base + left + right

= (12 *5) + (8*5) + (8*12) +(8*13)

= 60 + 40 + 96 + 104

= 300 cm²