Question

determine the coordinates of point a after a 90° clockwise rotation about the origin. a ( )

Explanation:

Step1: Recall rotation rule

The rule for a 90 - degree clockwise rotation about the origin for a point $(x,y)$ is $(x,y)\to(y, - x)$.

Step2: Identify coordinates of point A

From the graph, point A has coordinates $(1,2)$.

Step3: Apply rotation rule

Using the rule $(x,y)\to(y, - x)$ with $x = 1$ and $y = 2$, we get $(1,2)\to(2,-1)$.

Answer:

$(2,-1)$