1. 8.1 Ratio and Proportion

2. Definition of a Ratio A fraction comparing same units. Example :
2 feet to 4 inches.
Change to the same unit.
24 inches to 4 inches = 24/4
= 6/1
6 to 1

3. Reduce
Do not need the units in final answer.

4. Reduce
Do not need the units in final answer.

5. What are the sides if the perimeter is 56 inches
Isosceles triangle LNM

6. What are the sides if the perimeter is 56 inches
Isosceles triangle LNM
Sides 16, 20, 20

7. What is the Ratio of LM:MN
Isosceles triangle LNM

8. What is the Ratio of LM:MN
Isosceles triangle LNM

9. Ratio of angle of a triangle is 3:4:8
What are the angles?
3x + 4x + 8x = 180
15x = 180
x = 12

10. Ratio of angle of a triangle is 3:4:8
What are the angles?
x = 12
3(12), 4(12), 8(12)
36, 48, 96

11. QRS corresponds to VTU 3:2
Find TU, QS and TV

12. Proportions compares different units

13. Proportions compares different units

14. Solve
Find x

15. Solve
Find x

16. Homework
Page 461 – 464
# 12, 16, 20, 24,
28, 32, 36, 40,
44, 45 – 47, 51 – 61,
62 – 74 even