- A24
- B6
- C12
- D10
Step-by-Step Solution
A and C both lie on the -axis, so the base AC runs from to and is 6 units long. B is 4 units above the -axis, so the height is 4 units. Area = ½ × square units.
Answer: C) 12
The points A(−3, 0), B(0, 4) and C(3, 0) are joined to form a triangle. What is its area, in square units?
Class 9Coordinate GeometryCoordinate Geometry
Key idea: Plotting a point
To plot :
1. Start at the origin.
2. Move units along the -axis (right if positive, left if negative).
3. Move units along the -axis (up if positive, down if negative).
4. Mark the point.
Example: (3, −2). From origin, 3 right, 2 down. Lands in quadrant IV.
**Coordinates are ordered**: (3, 2) and (2, 3) are different points.
1. Start at the origin.
2. Move units along the -axis (right if positive, left if negative).
3. Move units along the -axis (up if positive, down if negative).
4. Mark the point.
Example: (3, −2). From origin, 3 right, 2 down. Lands in quadrant IV.
**Coordinates are ordered**: (3, 2) and (2, 3) are different points.
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