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Triangle OAB has vertices O(0, 0), A(4, 0) and B(0, 3). What is its area?

Class 9Figures on the Coordinate PlaneCoordinate Geometry
  • A7 sq units
  • B5 sq units
  • C12 sq units
  • D6 sq units

Step-by-Step Solution

OA = 4 lies on the -axis and OB = 3 on the -axis, so the right angle is at O. Area = ½ × sq units. (12 forgets the ½.)
Answer: D) 6 sq units

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