00:01
Okay, so our first part says the ball hits the first wall at an angle of 63 degrees.
00:05
So the measure of angle aef is equal to the measure of angle b -eh, which is equal to 63.
00:10
What's the measure of angle a -f -e? so a -e -f, so this angle right here is 63 degrees.
00:20
And since we know that this is a right triangle, because that's a right angle, then we can use our triangle -angle -sum theorem to find the measure of angle a -f -e.
00:31
90 minus 63 is equal to 27 degrees.
00:36
So this is our answer for letter a.
00:38
From the diagram for letter b, angle a, f, e is congruent to angle d, f, g, this one right here.
00:45
So this would also have to be 27 degrees.
00:49
And then we can find the measure of this angle, angle dgf, by again taking that same right triangle and subtracting 90 minus 27 to give us 63 degrees...