Page 118 - TB_5B

Objective: Review the properties of a prism and a pyramid
and find their surface areas

Each piece of bread that has the shape of rectangular prism is cut in
half to make 2 pieces of chocolate cake.

10 cm

10 cm

8 cm 8 cm

3 cm 3 cm 6 cm

Compare the area of the newly made surfaces.

Chat
Find the difference of the 2 surface areas of the cake pieces.
Discuss which piece has a larger surface area.

Find the surface area of a cube.

The width, length, and height of a cube are all the same length. So, you can find
the surface area of a cube by (area of a face) 6.

3 cm 3 cm 3 cm
3 cm 3 cm

3 cm

(Area of face) 3 3 9 (cm2)
(Surface area of cube) area of face) 6 9 6 54 (cm2)

28. Cover the Surface with Chocolate 107