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

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)?

One side of a parallelogram is 8 cm. If the corresponding altitude is 6 cm, then its area is given by

If the area of a square is equal to the area of an equilateral triangle, the ratio of the side of the square and the side of the equilateral triangle is

The sides of a triangle are 5 cm, 12 cm and 13 cm. then its area is

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