Amirror frame in the shape of an oval is shown below. the ends of the frame form semicircles:

which of the following is the perimeter of the inner edge of the frame?

You need to add up three things:
- two sides of 60" each (60*2=120")
- the perimeter of the upper semicircle (3.14*27/2=42.412")
- the perimeter of the lower semicircle (3.14*27/2=42.412")

After addition:
120+42.412+42.412=204.823"

I hope you got the idea!

Element 17 is chlorine it is a group 7 element(halogen) and belongs to period 3 of the periodic table