Length, Area and Volume

Goals

• Define and use the formula for calculating area of rectangular shapes
• Define and use the formula for calculating the area of a circle
• Define and use the formula for calculating the area of a rectangular volume
• Define and use the formula for calculating the volume of a cylinder

Discussion

• The area A of a rectangular object which is l units long and w units wide is given by A = lw;
• The area A of a circle, with radius r is given by A = πr²
• The volume V of a regular rectangular volume l units long, w units wide and h units high is given by V = lwh
• The volume V of a cylinder is given by V = πr²h
• The correct unit to use is tricky, but usually we want things to be between 1 and 999.
• so 1000cm is probably better expressed as 10m
• 1 m³ = 1 kl, liquid measure to volume

Examples

• Example 1: 106
• Example 2: 108
• Example 3: 112
• Example 4: 114

Homework