To find the area of a triangle on the XY plane with given vertices, you can use the formula for the area of a triangle:
Area = 1/2 * |x1(y2 - y3) + x2(y3 - y1) + x3(y1 - y2)|
In this formula, (x1, y1), (x2, y2), and (x3, y3) are the coordinates of the three vertices of the triangle.
In your case, the vertices are (2, 3), (9, 3), and (5, 6). Let's calculate the area:
Area = 1/2 * |2(3 - 6) + 9(6 - 3) + 5(3 - 3)|
Area = 1/2 * |-6 + 27 + 0|
Area = 1/2 * 21
Area = 10.5 square units
So, the area of the triangle is 10.5 square units.