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Special Right Triangles
1.
Two Special Right
Triangles 45°- 45°- 90° 30°- 60°- 90°
2.
45°- 45°- 90°
The 45-45-90 triangle is based on the square with sides of 1 unit. 1 1 1 1
3.
45°- 45°- 90°
If we draw the diagonals we form two 45-45-90 triangles. 45° 45° 45° 45° 1 1 1 1
4.
45°- 45°- 90°
Using the Pythagorean Theorem we can find the length of the diagonal. 45° 45° 45° 45° 1 1 1 1
5.
45°- 45°- 90°
1 2 + 1 2 = c 2 1 + 1 = c 2 2 = c 2 2 = c 45° 45° 45° 45° 2 1 1 1 1
6.
45°- 45°- 90°
Conclusion: the ratio of the sides in a 45-45-90 triangle is 1-1- 2 1 1 2 45° 45°
7.
45°- 45°- 90°
Practice 4 4 2 SAME leg* 2 4 45° 45°
8.
45°- 45°- 90°
Practice 9 9 2 SAME leg* 2 9 45° 45°
9.
45°- 45°- 90°
Practice 2 2 2 SAME leg* 2 2 45° 45°
10.
45°- 45°- 90°
Practice 14 SAME leg* 2 7 7 45° 45°
11.
45°- 45°- 90°
Practice Now Let's Go Backward
12.
45°- 45°- 90°
Practice 3 2 hypotenuse 2 45° 45°
13.
45°- 45°- 90°
Practice = 3 3 2 2
14.
45°- 45°- 90°
Practice 3 2 hypotenuse 2 3 SAME 3 45° 45°
15.
45°- 45°- 90°
Practice 6 2 hypotenuse 2 45° 45°
16.
45°- 45°- 90°
Practice = 6 6 2 2
17.
45°- 45°- 90°
Practice 6 2 hypotenuse 2 6 SAME 6 45° 45°
18.
45°- 45°- 90°
Practice 11 2 hypotenuse 2 45° 45°
19.
45°- 45°- 90°
Practice = 11 11 2 2
20.
45°- 45°- 90°
Practice 11 2 hypotenuse 2 11 SAME 11 45° 45°
21.
45°- 45°- 90°
Practice 8 hypotenuse 2 45° 45°
22.
45°- 45°- 90°
Practice = 4 2 8 2 2 2 * = 8 2 2
23.
45°- 45°- 90°
Practice 8 hypotenuse 2 4 2 SAME 4 2 45° 45°
24.
45°- 45°- 90°
Practice 4 hypotenuse 2 45° 45°
25.
45°- 45°- 90°
Practice = 2 2 4 2 2 2 * = 4 2 2
26.
45°- 45°- 90°
Practice 4 hypotenuse 2 2 2 SAME 2 2 45° 45°
27.
45°- 45°- 90°
Practice 6 Hypotenuse 2 45° 45°
28.
45°- 45°- 90°
Practice = 3 2 6 2 2 2 * = 6 2 2
29.
45°- 45°- 90°
Practice 6 hypotenuse 2 3 2 SAME 3 2 45° 45°
30.
30°- 60°- 90°
The 30-60-90 triangle is based on an equilateral triangle with sides of 2 units. 2 2 2 60 ° 60 °
31.
30°- 60°- 90°
The altitude (also the angle bisector and median) cuts the triangle into two congruent triangles. 1 1 30 ° 30 ° 2 2 2 60 ° 60 °
32.
30°- 60°- 90°
This creates the 30-60-90 triangle with a hypotenuse a short leg and a long leg. hypotenuse Short Leg Long Leg 30 ° 60 °
33.
30°- 60°- 90°
Practice 1 2 We saw that the hypotenuse is twice the short leg. We can use the Pythagorean Theorem to find the long leg. 60° 30°
34.
30°- 60°- 90°
Practice 1 2 3 A 2 + B 2 = C 2 A 2 + 1 2 = 2 2 A 2 + 1 = 4 A 2 = 3 A = 3 60° 30°
35.
30°- 60°- 90°
Conclusion: the ratio of the sides in a 30-60-90 triangle is 1- 2 - 3 3 1 2 60° 30°
36.
30°- 60°- 90°
Practice 4 8 Hypotenuse = short leg * 2 4 3 The key is to find the length of the short side. Long Leg = short leg * 3 60° 30°
37.
30°- 60°- 90°
Practice 5 10 Hypotenuse = short leg * 2 5 3 Long Leg = short leg * 3 60° 30°
38.
30°- 60°- 90°
Practice 7 14 Hypotenuse = short leg * 2 7 3 Long Leg = short leg * 3 60° 30°
39.
30°- 60°- 90°
Practice 3 2 3 Hypotenuse = short leg * 2 3 Long Leg = short leg * 3 60° 30°
40.
30°- 60°- 90°
Practice 10 2 10 Hypotenuse = short leg * 2 30 Long Leg = short leg * 3 60° 30°
41.
30°- 60°- 90°
Practice Now Let's Go Backward
42.
30°- 60°- 90°
Practice 11 22 Short Leg = Hypotenuse 2 11 3 Long Leg = short leg * 3 60° 30°
43.
30°- 60°- 90°
Practice 2 4 Short Leg = Hypotenuse 2 2 3 Long Leg = short leg * 3 60° 30°
44.
30°- 60°- 90°
Practice 9 18 Short Leg = Hypotenuse 2 9 3 Long Leg = short leg * 3 60° 30°
45.
30°- 60°- 90°
Practice 15 30 Short Leg = Hypotenuse 2 15 3 Long Leg = short leg * 3 60° 30°
46.
30°- 60°- 90°
Practice 23 46 Hypotenuse = Short Leg * 2 23 3 Short Leg = Long leg 3 60° 30°
47.
30°- 60°- 90°
Practice 14 28 Hypotenuse = Short Leg * 2 14 3 Short Leg = Long leg 3 60° 30°
48.
30°- 60°- 90°
Practice 16 32 Hypotenuse = Short Leg * 2 16 3 Short Leg = Long leg 3 60° 30°
49.
30°- 60°- 90°
Practice 3 3 6 3 Hypotenuse = Short Leg * 2 9 Short Leg = Long leg 3 60° 30°
50.
30°- 60°- 90°
Practice 4 3 8 3 Hypotenuse = Short Leg * 2 12 Short Leg = Long leg 3 60° 30°
51.
30°- 60°- 90°
Practice 9 3 18 3 Hypotenuse = Short Leg * 2 27 Short Leg = Long leg 3 60° 30°
52.
30°- 60°- 90°
Practice 7 3 14 3 Hypotenuse = Short Leg * 2 21 Short Leg = Long leg 3 60° 30°
53.
30°- 60°- 90°
Practice 11 3 22 3 Hypotenuse = Short Leg * 2 33 Short Leg = Long leg 3 60° 30°
54.
THE END
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