Rectangles and Circles

1
Rectangles and Circles

• Learning Outcomes
• Find perimeter of rectangles
• Find circumference of circles
• Find area of rectangles
• Find area of circles

2
Perimeter

• Perimeter means length around the outside
• P 14 feet

5
2
2
5
3
Problem Find the perimeter

• P 8m

3m
1m
4
Circumference

• For circles perimeter is called circumference
• C 2pr 2 x p x r
• C 2 x p x 5
• C 2 x p x 5
• C 31.32 cm

5 cm
5
Problem Find the circumference

• C 2pr

3 m
6
Area of Rectangles
2
4
Area of a rectangle is length times width Area of
this rectangle is 4 x 2 8 square feet
7
Problem Find the area
7mm
6mm
8
Area of Circles

• Area of circle pr2
• p x r x r
• p x 3m x 3m
• 28.27m2

3 m
9
Problem Find the area of the circle

• Area of circle pr2

4 cm