21. A square is inscribed in a circle of radius 1. Find the perimeter of the square.
22. A circle and a square intersect so that two sides of the square are radii of the circle. If a side of the square is 2 cm, what is the area of the region inside the square but outside the circle?
23. In \(ΔABC\), \(m∠A\) is \(34°\), and the exterior angle of vertex \(B\) is complementary to \(∠C\). Find \(m∠B\) in degrees.
24. Solve for \(x\) in the equation \(3 +\sqrt x =\sqrt{3x – 11}\).
25. The \(y\)-intercept of two perpendicular lines are \(b\) and \(-2\). The \(x\)-intercept are \(3\) and \(a\), respectively. If \(a + b = 15\), find the sum of the slopes of the two lines.