Question

Triangle ABC has vertices A(0, 4) , B(2, 1) and C(4, 3) . Find the coordinates of the vertices of ABC after a reflection over the -axis. Then graph the figure and its reflected image .

Answer 1

Answer:

Correct option is C)

Explanation:

Area of triangle ABC = 1 into 2 × AC

= 1 into 2 × 6×5

= 30 into 2 = 15sq.unit

or we can the formula as given below we know that the area of the triangle whose vertices are (X1,Y1),(X2, Y2) and ( X3, Y3) is 1 into 2|X1 ( Y2 - Y3 ) +X2 (Y3 - Y1) + X3 ( Y1 - Y3)