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# 5-5: Solving Right Triangles

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1. Alexis Mathis Aaron Goode Jessica Anderson 5-5: Solving Right Triangles

2. Unit Circle

3. Pythagorean theorem • a²+b²=c² • Used to determine the sides of a right triangle

4. Unit chart

5. Soh-Cah-Toa

6. Right triangle basics • Internal angle=180 • Right angle=90 • The other two angles must add up to 90 • The hypotenuse is the side of the triangle vertical the right angle

7.  Solve triangle ABC given side c = 25 cm and side b = 24 cm. • Solution.  To find the remaining side a, use the Pythagorean theorem: • a² + 24²  =  25² a²  =  625 − 576 = 49 a  =  = 7. Next, to find angle A, we have • cos A =  2425   =    96100 ,  on multiplying each term by 4.          =   .96

8. inverse • The arcsine, arccosine, and arctangent of relations

9. Examples: arcsine • Sinx=4/9 • X=arcsine4/9 • Sinx=8/24 • X=arcsine8/24

10. Examples: arccosine • Cosx=3/4 • X=arccosine3/4 • Cosx=5/7 • X=arccosine5/7

11. Examples: Arctangent • Tanx=9/16 • X=arctan9/16 • Tanx=5/11 • X=arctan5/11

12. Using inverse to solve right triangles • a=4 • c=6 • SinA=4/6 • A=arcsin4/6

13. Using inverse.. • b=3 • c=6 • CosA=3/6 • A=arccos3/6

14. Word problems • A six-meter-long ladder leans against a building. If the ladder makes an angle of 60° with the ground, how far up the wall does the ladder reach? How far from the wall is the base of the ladder?

15. Word problems • A five-meter-long ladder leans against a wall, with the top of the ladder being four meters above the ground. What is the approximate angle that the ladder makes with the ground?