Is 83 a perfect square? true false don't answer if you do not know the answer. i need the correct answer.

If there are 12 moths and some have 31 days and others have 30 days how many have 28 days?

Based on the diagram, match the trigonometric ratios with the corresponding ratios of the sides of the triangle. tiles : cosb sinb tanb sincposs matches: c/b b/a b/c c/a

Extra points! find the missing dimension! need asap