The ratio of the angles ∠A and ∠B of a non-square rhombus ABCD is 4 : 5, the value of ∠C will be

If the radii of circles A and B are in the ratio 1.5: 1, then the areas of the circles A and B will be in the ratio

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 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 diagonals of a rhombus are 8 cm and 10 cm, then the area of the rhombus is

A triangle has side lengths x cm, x + 31 cm and x + 26 cm. If its area is 126 square cm, then what is the value of x ?