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Math 10C
Trigonometry Lesson #5
Solving Right Triangles
Objective: By the end of this lesson you will be able to:
Quick Review:
To find an angle in a right triangle using trig ratios:
To find a side in a right triangle using trig ratios:
“Solving a right triangle” means to determine:

the length of every __________ and

the measure of every _____________
We use three processes to solve right triangles:
1.
2.
3. Sum of angles in a triangle = __________
To solve a right triangle, we need to be given either:
1. the lengths of ____________________ or
2. the length of ___________________ and the measure of _______________________.
Math 10C
Trigonometry Lesson #5
e.g. 2) Solve PQR . Give all sides to the nearest tenth and all angles to the nearest degree.
Q
P
12 cm
16 cm
R
e.g. 3) Solve STU . Give all sides to the nearest tenth and all angles to the nearest degree.
U
27
S
T
32 yd
Assignment:
p. 111-112 #6-12