Question

For problems 6-7, find the surface area of the regular rpyramids shown to the nearest whole number.

6.
72ft
128ft
56ft
22ft

7.
1300m2
390m
650m2
628m2

Answer 1

6. Base =
`4 * 4 = 16`

1 side =
`(1)/(2) * 4 * 7 = 14`


`14 * 4 = 56`

Total area

`= 56 + 16 \\ = 72 {ft}^(2)`

7.

`(1)/(2) * (6 * 10) * 5 √(3) = 259.81`


`(1)/(2) * 10 * 13 = 65`


`65 * 6 = 390`

Total area =

`390 + 260 = 650 {m}^(2)`


Hope this helps. - M

Answer 2

6. Base = 4*4 = 16
1 side = 1/2 x 4 x 7 = 14
14 x 4 sides = 56

total: 56 + 16 = 72 ft^2

7.
base = 1/2 x perimeter x apathem
base = 1/2*(6*10) * 5sqrt3
base = 259.81 round to 260

1 side = 1/2 x 10 x 13 = 65
6 sides = 65 *6 = 390

total = 390 + 260 = 650 m^2