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.