19.4 Surface Area of Spheres CW

The surface area is the.......

• Filling in a 3 dimensional shape

• wrapping the outside of a 3 dimensional shape

What is the surface area? $S.A.=4\pi r^2,\ where\ r\ is\ the\ radius.$  

• 6658.56 mm²

• 452.39 mm2

• 904.32 mm²

• 108.8 mm²

Find the surface area of the sphere, given diameter is 10. $S.A.=4\pi r^2,\ where\ r\ is\ the\ radius.\ Remember\ to\ cut\ the\ diameter\ in\ half.$  

• 314.16 in²

• 314 in²

• 166.67 in²

• 521.24 in²

What is this formula?

• suface area of a cone

• surface area of a sphere

• volume of a cone

• volume of a sphere

Find the surface area when r=25cm.
remember to look at the units!!!! $S.A.=4\pi r^2,\ where\ r\ is\ the\ radius.$  

• 2500 cm²

• 2500 cm³

• 7850 cm²

• 7850 cm³

Find the surface area when r=21.5 inches.
Choose the correct units. $S.A.=4\pi r^2,where\ r\ is\ the\ radius.$  

• 5808.8 in²

• 1849 in²

• 1849 in³

• 5805.9 in³

Find the surface area of the hemisphere. $S.A.=3\pi r^2,\ where\ r\ is\ the\ radius.$  

• 904.3 in²

• 339.3 in²

• 113.0 in²

• 452.2 in²

What is the surface area of the sphere? $S.A.=4\pi r^2,\ where\ r\ is\ the\ radius.$  

• 50.265 ft2

• 25.133 ft²

• 100.512 ft²

• 4 ft²

For a sphere with a radius of 8, what is the Surface Area? $S.A.=3\pi r^2,\ where\ r\ is\ the\ radius.$  

• 603.19

• 10096.2304

• 2143.573

• 100.48

Find the surface area. $S.A.=4\pi r^2,\ where\ r\ is\ the\ radius.\ Remember\ to\ cut\ the\ diameter\ in\ half.$  

• 221.7 cm2

• 70.6 cm³

• 17.6 cm³

• 886.2 cm²