Answer:
50
Explanation:
The total angle of a triangle is 180
so add 77 and 53 to find out what you have so far
77 + 53 = 130
then you need to find the difference which you do by subtracting
180 - 130 = 50
so x = 50
50°
all triangles = 180°
add 53 + 77 = 130
subtract 180 - 130 = 50
giving you your answer of 50°
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