00:01
Every triangle has six parts, three sides and three angles.
00:11
Let's see what we know about this particular triangle.
00:15
Angle b is 20 degrees 50 minutes.
00:20
Angle c is 103 degrees 10 minutes.
00:26
And side a, c is 132 feet.
00:30
Well, typically law of signs when we write that, we use lowercase letters for the sides, just to make it easier to distinguish between the sides and the angles.
00:39
But remember, side a falls between angles b and c.
00:44
So we could also call that side b.
00:47
Side b falls between angles a and c, and side c falls between sides a and b.
00:54
So with different ways of referencing the same side of my triangle.
00:59
So ac is 132 feet.
01:05
Okay, so i have three pieces that i know, and there's three pieces that i need to find out.
01:11
Let's start with our unknown angle first.
01:15
Every triangle has three angles that add up to 180 degrees.
01:20
So to find my missing angle, i'm going to start with 180 and subtract the two angles that i know...