a) Prove that the triangle whose vertices are: \( A(5, -5) \), \( B(1, 7) \) and \( C(15, 15) \) is right-angled at \( B \), then find its area.
Area = 100 square units
Area = 80 square units
Area = 120 square units
Area = 60 square units
MR/Nasef.N
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