1. 8th Grade Math Chapter 9a Review

2. Give the formulas for: Chapter 9b Review a) area of a circle
b) circumference of a circle

3. Answer Give the formulas for: Chapter 9b Review a) area of a circle
b) circumference of a circle
A = r2
C = d

4. 2) Give the formulas for: a) area of a triangle b) area of a trapezoid
Chapter 9b Review
2) Give the formulas for:
a) area of a triangle
b) area of a trapezoid

5. 2) Give the formulas for: a) area of a triangle b) area of a trapezoid
Answer
Chapter 9b Review
2) Give the formulas for:
a) area of a triangle
b) area of a trapezoid bh
A = 2
(b1 + b2)h
A = 2

6. Chapter 9b Review
3) Find the perimeter and area of a rectangle with l = 12 m and w = 4 m.

7. Answer
Chapter 9b Review
3) Find the perimeter and area of a rectangle with l = 12 m and w = 4 m.
Perimeter = 32 m
Area = 48 m2

8. 4) Find the perimeter and area of this triangle.
Chapter 9b Review
4) Find the perimeter and area of this triangle.
8 in
6 in
5 in
10 in

9. 4) Find the perimeter and area of this triangle.
Answer
Chapter 9b Review
4) Find the perimeter and area of this triangle.
Perimeter = 24 in
Area = 25 in2
8 in
6 in
5 in
10 in

10. 1) Find the perimeter and area of each figure
Chapter 10a Review
1) Find the perimeter and area of each figure
Rectangle with length 4m and width 0.5m.
2 in
1.5 in
8 in

11. Answer 1) Find the perimeter and area of each figure
Chapter 10a Review
1) Find the perimeter and area of each figure
Rectangle with length 4m and width 0.5m.
2 in
1.5 in
8 in
Perimeter = 20 in, Area = 12 in2
Perimeter = 9 m, Area = 2 m2

12. 2) Find the perimeter and area of each figure
Chapter 10a Review
2) Find the perimeter and area of each figure
5 m
5 m
3 m
8 m

13. 2) Find the perimeter and area of each figure
Answer
Chapter 10a Review
2) Find the perimeter and area of each figure
5 m
5 m
3 m
8 m
Perimeter = 21 m, Area = 19.5 m2

14. 3) What is the shaded area?
Chapter 10a Review
3) What is the shaded area?
8 cm
3 cm
4 cm

15. 3) What is the shaded area?
Answer
Chapter 10a Review
3) What is the shaded area?
8 cm
3 cm
4 cm
Area = 64 – = cm2