The vertex is the highest point!!
A. <1, <2, and <3 added together have to equal 180 so <1+<2= 77, triangles equal 180 in total. 180-77=103, <3=103. <3 and <4 are supplementary so they have to equal 180 which is what <1 + <2 equaled
b. 77
Answer:
m<1 = 69°
Step-by-step explanation:
Angles 20x + 11 and 25x - 14 are vertical angles, so they are congruent.
25x - 14 = 20x + 11
5x = 25
x = 5
The actual measure of angle 20x + 11 is 20(5) + 11 = 111°.
Angle 20x + 11 and <1 are supplementary, so the sum of their measures is 180°.
m<1 + 111° = 180°
m<1 = 180° - 111°
m<1 = 69°
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