The value of x in the given figure is: (Figure: an arrowhead (concave quadrilateral) A–C–(inner vertex)–B. Angle at A = 55°, angle at C = 30°, angle at B = 45°; x is the angle at the inner (concave) vertex facing A.)

In a quadrilateral ABCD, AB = 6 cm, BC = 18 cm, CD = 6 cm and DA = 10 cm. If the diagonal BD = x, then which one of the following is correct?

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

In the following figure, AB ∥ CD. Find the value of x°. (Figure: lines AE and CE meet at the top point E, where the angle is x°. At A, the angle between AB and AE is 50°. C lies on the line from E go…

A circle touches all four sides of a quadrilateral ABCD whose sides are AB = 8 cm, CD = 9 cm and BC = 7 cm. The length of side AD (in cm) 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)?