Answer:
about 13.50$
Step-by-step explanation:
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Work Shown:
base = 8, height = 6
area = (1/2)*base*height
area = (1/2)*8*6
area = 0.5*8*6
area = 4*6
area = 24
the missing angle is 148°
the sum of all exterior angles of a triangle are 360°
so, 360-138-74 = 148°