Do now

Step 1) Clear out an old do now. Create a center point circle with a radius of 20:

Step 2)  Make a diameter

Step 3) Use the scissor tool to cut the bottom half of the circle off

Step 4)  Make a  vertical construction line right up the middle of the circle

step 5) Add 2 lines symmetric about the construction line

Step 6) the angle should be 40 . How to dimension an angle

result :

step 7)

step 8)