Ametal washer is made by cutting out a circle 13.2 mm in diameter from a larger circle. to the nearest tenth, what is the area of the washer?

The area of the washer will be found by calculating the area of the shaded part.
Area of larger circle:
A=πr²
r=4.4+(13.2/2)=11 mm
thus
A=π×11²=380.13

Area of the small circle:
A=π×(13.2/2)²=136.85 mm

The area of the washer will be:
380.13-136.85
=243.28
~243.3 mm²

I  dont  know much about vertexes but i know to solve this function you need to use foil method and then corresponmd the vertex with the actual coordinates, hope i !