Eight equidistant points lie on a circle. Using these points as vertices, right angled triangles are drawn such that one side of each triangle is diameter of the circle. The number of such possible right angled triangles is :

If a, b and c are the sides of a right-angled triangle, where a > b > c, then what is the value of the expression (a + b + c) (a + b - c) (a - b + c) (a - b - c)?

If each interior angle of a regular polygon is 150°, then the number of sides in that polygon is :

If all the sides of a parallelogram are equal and one angle is a right angle, then it is called as

The sides of an equilateral triangle are (2a – b) cm, (a + 3b) cm and (2a – 2b + 1) cm then the perimeter of the triangle is

The perimeter and the area of a right-angled triangle are 36 cm and 54 square cm respectively. What is the length of the hypotenuse ?