Dilate the triangle by a scale factor of 1/2 about the origin and give the coordinate of A'.
To dilate a figure, such as a triangle, by a scale factor of 1/2 about the origin, you multiply the coordinates of each vertex by the scale factor.
Let's assume the original coordinates of the triangle are A(x1, y1), B(x2, y2), and C(x3, y3). To find the new coordinates after dilating, you multiply each coordinate (x, y) by the scale factor of 1/2.
So, to find the coordinate of A' after dilating, you would multiply the original coordinates of A(x1, y1) by 1/2.
A'(x1', y1') = (x1 * 1/2, y1 * 1/2)
So, if you provide the original coordinates of A (x1, y1), I can help you calculate the coordinate of A' after dilating it by a scale factor of 1/2 about the origin.