00:01
We want to solve a right triangle for all unknown sides and angles.
00:10
If we know angle b, i'm guessing it's angle c that is the right angle.
00:22
If angle b is 71 .2 degrees, inside a is 4 .5, then the measure of angle a would have to be the difference of 9 .5.
00:45
And 71 .2, which is 18 .8 degrees.
00:49
Now if it is not in your diagram angle c that's right angle, then you're going to have to switch these around.
01:04
Side b inside c to two decimal places, let's refer to right triangle trig ratio sine cosine tangent.
01:18
Let's go off the 71 .2 degree angle, and if we want to find side b, then it would be true that since that's opposite, and we know the adjacent that tangent of 71 .2 degrees is equal to opposite over adjacent.
01:33
So multiply both sides by 4 .5 and you've solved for b.
01:36
Now in the main degree mode to do this.
01:40
So 4 .5 tangent 71 .2 is 13 .22 to two decimal places...