Question 3 1 pts
The three angles of a triangle add up to 180°. If two angles are 57and 8what is the measure of the third angle?
39
96
141°
123

39

Step-by-step explanation:

assuming the angles are 57 & 84

141 + 57 > 180

123 + 57 = 180 (no room for an 8)

96 + 57 = 153

180 - 153 = 27 (an 8 doesn't work for this answer)

57 + 39 = 96

180 - 96 = 84 ( we have a winner!)

b) k’(6, 4); l’(3, 3)

step-by-step explanation:

a 270° clockwise rotation maps every point (x, y) to (y, -x). (it negates the x-coordinate and then switches it and the y-coordinate.)

this means the endpoints of the side congruent to kl, k' and l', would be mapped as:

k'(-4, 6)→(6, 4)

l'(-3, 3)→(3, 3)