Gielh's Surface area and volume post

1) (bxh/2)xh

5x3/2 15/2 = 7.5

7.5x8.5= 63cm3

2) lxwxh

20x8x16= 2 560 cm3

3) (bxh)h

4x8/2 32/2 = 16

16x6.5= 104

104÷8x3 = 39cm3

4) πr2

r=d/2

r= 12/2

r= 6

3.14x6x6= 103. 04

103.04x15 = 1695.6cm3

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Video of a Surface Area: