Answer:
1. draw a circle inside the triangle
2. draw a circle through those dots
3. draw a circle outside the triangle but through the dots
4. create a triangle with the same angle and length and draw a circle inside that triangle
5. Draw a right triangle (with 90 degrees; could be 45-90-45 or 30-60-90)
a. hypotenuse is the diameter of the circle
b. hard to explain but it should look like this: (link)