Use the polygon tool to draw a right triangle with hypotenuse cd.

he means x 5 y -1

Step-by-step explanation:

Your third point should be above D at (5,-1) to form a right triangle.

Step-by-step explanation:

Easiest way is draw a vertical line at point D and a horizontal line at point C, where they intersect will be (5,-1) which will form a right triangle.

Still need convincing? Let's solve it by the fact that if we're talking about right triangles, we can use Pythagorean theorem.

By Pythagorean theorem we have:

Where c is the hypotenuse (CD), and a and b are the shorter of the three legs of the triangle.

Therefore,

We don't need to evaluate what c is but it is , what we need to focus on is the 9^2 and (-5)^2.  The first number 9^2 tells us that from C we must move 9 units to the right or (-5)^2 means 5 units up from point D which will return the same answer (5,-1).  So one of the legs is 5 units long, the other is 9 units long and the hypotenuse is units long.

step-by-step explanation: