Question

1 Name the solid with the description as a figure that has one base that is a rectangle and four lateral surfaces that are triangles. (1 point)

triangular pyramid cone rectangular prism rectangular pyramid 2 A solid with two parallel and congruent bases cannot be which of the following? (1 point)
cone prism cylinder cube 17 A cone has a radius of 15 cm and a volume of 540 cm3. Find the volume of a similar cone with a radius of 10 cm. (1 point)
54 cm3 240 cm3 160 cm3 360 cm3 18 Find the surface area of a sphere with a radius of 5 meters. (1 point)
about 250 m2 about 314 m2 about 340 m2 about 523 m2 19 Find the volume of a sphere with a radius of 5 meters. (1 point)
about 560 m3 about 314 m3 about 340 m3 about 523 m3 My answers: 1. rectangular pyramid 2. cone 17. 240 cm 18. about 314 19. about 523

Answer 1

1. rectangular pyramid has 1 base and 4 later surfaces
2. a cone cannot have a two parallel and congruent bases because a cone only has oone base
3. V2 / V1 = ( r2 / r1)^3
V2 / 540 = ( 10 / 15 )^3
v2 = 540 ( 10 / 15) ^3
V2 = 160
4. A = 4pir^2
A = 4pi ( 5^2)
A = 314