1) Find the surface area of a sphere with a radius of 8 cm.
A 267.9 cm
B 803.8 cm
C 2143.6 cm
D 2010. cm
2) Find the surface area of a sphere with a radius of 4 ft.
A 452.2 m
B 150.7 m
C 113.0 m
D 904.3 m
3) Find the volume of a sphere with a radius of 4 ft.
A 33.5 ft
B 67.0 ft
C 267.9 ft
D 803.8 ft
4) For the pair of solids, find the value of the variable
A 3 cm
B 18 cm
C 16 cm
D 2 cm
5) For the repair of solids, find the value of the variable
A 12 mm
B 48 mm
C 20 mm
D 3 mm
6) A pyramid has a height of 5 in. And a surface area of 90 in. Find the surface area of a similar pyramid with a height of 10 in. Round to the nearest tenth. if necessary.
A 360 in
B 180 in
C 22.5 in
D 3.6 in
7) A rectangular prism width of 92 ft and a volume of 240 ft. Find the volume of a similar prism with a width of 46 ft. Round to th nearest tenth, if necessary.
A 30 ft
B 40 ft
C 60 ft
D 120 ft
1.B
2.12m2 not 4ft/ 2.=A
3.C
4.D
5.A
6.A
7.A
I got some of these wrong at first then corrected it this is correct.
1. B
2. A
3. C
4. D
5. A
6. A
7. A
No ideas? Just to refresh your memory
volume of sphere = 4/3 πr^3
area of sphere: 4πr^2
#4,5 ???
if there is a linear scale factor of s,
...the area changes by a factor of s^2
...the volume changes by a factor of s^3