Step 1) Make sure you’re workspace units are millimeters

Step 2) Create a 3 point arc. Dimensioned to a radiu of 30, then add a vertical line:

 

Step 3) Dimension the vertical line:

 

Step 4) Use the spline tool to create this :

Step 5)  Add 2 circles and dimension both of them to 12 (smaller ) and 50 (outer) as shown below:

 

Step 6) Select the cut tool

 

Step 7) remove the indicated region:

 

Step 8) Select the mirror icon and the mirror line indicated:

Step 9) Reflect everything!

 

Step 10) Use the scissor tool to delete the mirror line.

 

Step 11) Add 4 shapes of your choosing (line, rectangle, circle etc). Make Sure that all of the shapes are dimensioned. Submity your screenshot in google classroom assignment.

Do Now

Step 1) Create the right triangle above. The hypotenuse dimensioned to 30, the vertical altitude is a construction line and the the other leg is dimensioned to 21.

 

Step 2) Mirror the triangle over the construction line

Result :

Step 3)  Circumscribe circle that is dimensioned to 42

Final result: