What is called the square root of a positive number α and how is it denoted? Mark the following statements with (T) if they are true or with (F) if they are false. It holds that √(–5)² = –5. If x < 0, then (√–x)² = –x. For every α, β ≥ 0, it holds that √α + √β = √α + β. It holds that: √1 + √5 + √11 + √25 = 2. What is an inscribed angle? When is a polygon called regular? What is the relationship, in degrees, between an inscribed angle and the corresponding arc? Given the function y = –x + 4. Complete the following value table. Draw its graph. Find the points of intersection of the graph with the axes and name them A and B. Then calculate the length of the hypotenuse of the right triangle OAB, where O(0,0) is the origin of the axes. An isosceles triangle ABC has base BC = 16 cm and perimeter 36 cm. Find its height and area.