1. Warm Up Find the value of x. Leave your answer in simplest radical form. 7 x 9 x 7 9

2. 7.3: Special Right Triangles Objectives: To use the properties of 45-45-90 and 30- 60-90 right triangles

3. 45°-45°-90° Right Triangle It is an isosceles, right triangle– Both legs are congruent!! THEOREM: The hypotenuse is times the length of the legs IF YOU NEED TO FIND THE HYPOTENUSE: Hypotenuse = (Length of Leg) X IF YOU NEED TO FIND A LEG: Length of leg =

4. Examples: 1.Find h:2. Find x: 9 h x

5. Find x: x

6. 1.2. 6 x x

7. Find x: 10 x

8. A square has a perimeter of 24 inches. How long is the diagonal?

9. 30°-60°-90° Right Triangle  Shorter Leg is the side opposite the 30° angle  Longer leg is the side opposite the 60° angle Let the shorter leg = n HYPOTENUSE = 2 ∙ SHORTER LEG = 2n LONGER LEG = SHORTER LEG = n

10. If you need to find the shorter leg (side opposite 30°): If given the hypotenuse: SHORTER LEG = If given the longer leg: SHORTER LEG=

11. Fill in the table of values for the side lengths of a 30-60-90 triangle: Shorter LegLonger LegHypotenuse 3 4 15 34 10

12. Find the missing lengths. 1.2. 60 30 g f 5 x y

13. Find the variables. 1.2. 30 60 4 x y 30 k m

14. Find the value of each variable. (Figure not drawn to scale) b cd a 4530

15. Find the value of each variable. Leave your answer in simplest radical form. b a 4 45°

16. Find the area. Round your answer to the nearest tenth. 60

17. Find the area of the triangle. 45