If a figure can match itself in 3 positions, what is the angle of rotation?

Asquare has a side that measures 11 units. what is the area of a circle with a circumference that equals the perimeter of the square? use 3.14 for π, and round your answer to the nearest hundredth. 1519.76 units2 379.94 units2 616.56 units2 154.14 units2

Aquadratic equation in standard from is written ax^2= bx+c, where a,b and c are real numbers and a is not zero?

How do i simply this radical expression?