1. Lesson 8.4 Areas of Composite Figures
Day 1
Lesson 8.4 Areas of Composite Figures
Students will be able to find the area of a composite figure as evidenced by the Area worksheet

2. Warm-Up #11 Find the area of this semicircular object.
Find the perimeter of this semicircular object.
A simple impact crater on the moon has a diameter of 15 kilometers. A complex impact crater has a radius of 30 kilometers. How much greater is the circumference of the complex impact crater than the simple impact crater?

3. Hw Solutions. Workbook page 178

4. Composite Figure:
A figure (or shape) that can be divided into more than one of the basic shapes.

5. Use tangrams to help explain area

8. Total area = 40 + 32 = 72 cm2 4cm 2cm 4cm Area = 4 x 10 10cm Area =

9. On Your Own: Find the area of the composite figures
6cm
11cm
2cm
4cm
5cm

10. Total area = 45 + 20 = 65 cm2 Perimeter = 36 cm Area = Area = 4 x 5

11. Total area = 10 + 36 = 46 cm2 Perimeter = 34 cm Area = 2 x 5 10cm2

12. Total area = 28 + 16 + 21 = 65 cm2 Perimeter = 42 cm Area = Area =
4 x 7
Area =
4 x 4
28cm2
16cm2
4cm
3cm
3cm
3cm
Area =
3 x 7
4cm
7cm
7cm
21cm2
11cm

13. Total area = 77 – 12 = 65 cm2 Perimeter = 42 cm Area = 3 x 4 12cm2