## Chapter 13, Volumes and Surface Areas of Solids

## 13.1**Volumes and total surface areas of a cube and a cuboid**

- concept of net

A net of a solid is a plane figure that can be folded up to form the solid.

- volume and total surface

The volume of cube = x*x*x

The total surface area of cube = 6x*x

where x is the length of a side of the cube

The volume of cuboid = Length x Width x Height = l*w*h

The total surface area of cuboid = 2*(lw + lh + wh)

**HW**- handout: two pages
- workbook: page 35, #1, #2, #3