
Select the left quarter circle. Move it to another area of your page.
Select the quarter circle. CTRL -d to duplicate it.
To make the copy 4 times larger - Select the width and height and multiply them by 4.
You can do this by clicking on the right side of the number then Shift and 8 and enter
Select the larger quarter circle and lower it to the bottom. Circled in blue.
Select both quarter circles. Click on Align right circled in green.