I got 175 points plz help mee get more

Apath 3 m wide runs around the inside of a square park inside 60 m.find the area of the path.pls

The ratio pv to nrt is plotted against pressure for ch4 at 0°c and 200°c. why does the curve for 0°c drop below the horizontal line for an ideal gas whereas the curve for 200°c does not?

Express the following as a function of a single angle. cos(60) cos(-20) - sin(60) sin(-20)