Reply asap what is the formula for finding the area of a regular polygon with perimeter p and apothem length a // a.) 719 sq units b.) 1039 sq units c.) 1359 sq units d.) 373 sq units

Pls never taught i’m really confused and i rlly need

If 0° ≤ θ ≤ 90° and cosθ = 11 15 , what is the value of sin (90° - θ)? a) 11 /15 b) 15/ 11 c) 15 /4 d) 4/15

Consider u = {x|x is a negative real number}which is an empty set? o {x|x eu and x has a negative cube root}o {x|x eu and x has a negative square root}{x|x eu and x is equal to the product of a positive number and -1}{x|x eu and x is equal to the sum of one negative and one positive number?