P(3, 3), Q(7, 6) and R(3, 6) are the coordinates of a triangle. A, B and C are the reflection points of P, Q and R respectively about Y = 0. The area of the triangle formed by the points B, C and D(3, -9) is ___ square units.
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Solution
Reflection about Y = 0, X - Coordinate remain same and Y - Coordinate sign changes. A = (3, -3), B = (7, -6) and C = (3, -6). The area of the triangle BCD, BCD is a right-angled triangle. BC = 4 and CD = 3 Area of triangle = 12×3×4 = 6 square units