GEO: 8-3 QC (inverse functions)
1. Use your calculator to find:
8.3
tan-1 (.76) = 
round to the nearest degree
2. Use your calculator to find:
8.3
sin-1 (.33) = 
round to the nearest degree
3. Use your calculator to find:
8.3
cos-1 (.5) = 
round to the nearest degree
round to the nearest 
degree
8.3
m∡A = 
4. Given the side lengths of the triangle below,find the measure of angle A.
A
12
C
10
B
round to the nearest 
degree
8.3
m∡A = 
5. Given the side lengths of the triangle belowfind the measure of angle A.
A
18
C
11
B
round to the nearest 
degree
8.3
m∡A = 
6. Given the side lengths of the triangle belowfind the measure of angle A.
A
12
10
C
B
round to the nearest 
degree
8.3
m∡A = 
7. Given the side lengths of the triangle belowfind the measure of angle A.
A
12
6
C
B
round to the nearest 
degree
8.3
m∡A = 
8. Given the side lengths of the triangle belowfind the measure of angle A.
A
8
7.2
C
B
round to the nearest 
degree
8.3
9. Given the side lengths of the triangle belowfind the measure of angle A.
C
B
m∡A = 
10.4
11.2
A
m∡A = 
round to the nearest 
degree
8.3
10. Given the side lengths of the triangle belowfind the measure of angle A.
C
14.1
10
B
A
m∡A = 
round to the nearest 
degree
8.3.1
11. Given the side lengths of the triangle belowfind the measure of angle A.
C
3
B
A
3
12. Use the given information to "solve" the righttriangle.  (Find all missing information.)
8.3
∡L =
MN = 
ML = 
round side lengths to the nearest tenthand angles to the nearest degree 
M
41o
L
N
8
13. Use the given information to "solve" the righttriangle.  (Find all missing information.)
8.3
∡L =
∡N = 
ML = 
round side lengths to the nearest tenthand angles to the nearest degree 
M
L
3
8
N
14. Use the given information to "solve" the righttriangle.  (Find all missing information.)
8.3.2
∡L =
∡N = 
NL = 
round side lengths to the nearest tenthand angles to the nearest degree 
11
M
L
16.94
N
15. Use the given information to "solve" the righttriangle.  (Find all missing information.)
8.3
MN = 
∡L =
∡N = 
round side lengths to the nearest tenthand angles to the nearest degree 
M
L
6
10
N
ladders angle =
Find how high up thewall the ladder reaches.
16. The base of a 15 ft. ladder is 3 feet away from a wall. Find the angle the ladder makes with the ground
round to the nearest degree
round to the nearest tenth
8.3
h = 
Find this angle
Find the height of the
ramp (a).
17. A skateboard ramp has the following measurements.  Use its measurements to find the angle of the ramp.
ramps angle =
8.3
round to the nearest degree
round to the nearest tenth
a = 
Find this angle
18. A water ski ramp has the given dimensions.  Findthe angle at which the skier hits the ramp. 
Find the height of the ramp (h)
ramps angle =
round to the nearest tenth of a foot
round to the nearest degree
h =
8.3.2
Find this angle
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