Michael's Surface Area Post

Rectangular Prism



T
The L is 5 and the W is 10.
10 x 5 = 50

F
The L is 6 and the W is 10.
10 x 6 = 60

S
The L is 6 and the W is 5.
5 x 6 = 30

TSA= 2 ( T + F + S )
= 2 ( 50 + 60 + 30 )
= 2 ( 140 )
= 280 m2

Triangular Prism



b x h divided by 2
8 x 9 divided by 2
72 divided by 2
= 36

l x w
5 x 27 = 135 cm2
36 cm2
+ 36 cm2
= 207 cm2

Cylinder



2 (pie r2) + (pie x d x h)
= 2 (3.14 . 4 . 4) + (3.14 x 8 x 12)
= 100.48 + 301.44
= 401.92 mm2

1.


AOB.h
divided by 2 x h

3x5
divided by 2

15
divided by 2 x h

7.5 x 8.5 = 63.75cm3

2.

AOB.h
l x w x h
20 x 8x 16 = 2,560 cm3

3.


AOB.h
bxh
divided by 2 x h

4x8
divided by 2

32
divided by 2 x h

16 x 6.5 = 104 cm3

4.


AOB.h
pie r2 .h
3.14 .6 .6 15 = 1,695.6 cm3