Answer:
45
Step-by-step explanation:
All angles in a triangle add up to 180.
80 + 55 = 135
180 - 135 = 45
C² = a² + b²
c² = 17.5² + 47.1²
c² = 306.25 + 2218.41
c² = 2524.66
c ≈ 50.2
It is correct.
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