Special Right Triangles
Inverse Trig Functions (Answers in Degrees)
Degrees
Radians
Right Triangles
100
The value of X. 
What is 7
100
\sin^-1(\frac{1}{2})
What is
30^\circ
100
\sin45^\circ
What is
\frac{\sqrt{2}}{2}
100
\sin \frac{\pi}{6}
What is
\frac{1}{2}
100
Find angle A in the triangle when a = 4 and b = 5.
Round your answer to the nearest tenth (1 decimal).
What is 38.7o.
200
The value of c
What is
7\sqrt2
200
\cos^-1(1/2)
What is
60^\circ
200
\cos 150^\circ
What is
-\frac{\sqrt{3}}{2}
200
\cos \frac{\pi}{2}
What is 0.
200
Find angle B in the triangle when b = 25 and c = 30.
Round your answer to the nearest tenth (1 decimal).
What is 56.4o.
300
The value of Y
What is 2
300
\tan^-1(1)
What is
45^\circ
300
\tan 270^\circ
What is undefined.
300
\tan \frac{5\pi}{4}
What is 1
300
Find angle A in right triangle ABC when a = 5 and c = 10.
What is 30o.
Since side a is half of side c, then this is a 30-60-90 triangle.
400
The value of Y
What is 2.
400
\tan^-1 \sqrt{3}
What is
60^\circ
400
\cos 300^\circ
What is
\frac{1}{2}
400
\tan 0
What is 0.
400
Find side a in right triangle ABC when A = 40o and b = 10.
Round your answer to the nearest tenth (1 decimal).
What is 8.4.
500
The value of x.
What is
4\sqrt3
500
\cos^-1 \frac{\sqrt{3}}{2}
What is
30^\circ
500
\tan(-60^\circ)
What is
-\sqrt{3}
500
\sin (-\frac{2\pi}{3})
What is
-\frac{\sqrt{3}}{2}
500
Find angle B in right triangle ABC when a = 3 and c =
3sqrt2
What is 45o.
Since side c is square root 2 times side a, then this is a 45-45-90 triangle.