Find the second diagonal of a rhombus when it’s first diagonal length is 12 cm and its side is 10 cm?

AB is diameter of a circle with centre 'O'. CD is a chord which is equal to the radius of the circle. AC and BD are extended so that they intersect each other at point P. Then find the value of ∠ APB.

If the area of a circle is 9π sq.cm then it circumference is

In △PQR, ∠P = 90°. S and T are the mid points of sides PR and PQ, respectively. What is the value of RQ²/(QS²+ RT²)?

5√2 cm in a circle. If the long chord makes a right angle at the centre, then what will be the length of the radius of the circle?

ABCD is a rhombus whose one angle is 60°.Find the ratio of the lengths of its diagonal?

In a quadrilateral ABCD, E is a point in the interior of the quadrilateral such that DE and CE are the bisectors of ∠D and ∠C, respectively. If ∠B = 82° and ∠DEC = 80°, then ∠A = ?

Triangle PQR is such that PQ=9 cm, QR=6 cm, PR=7.5 cm and triangle PQR is similar to triangle XYZ. If XY=18 cm, find the value of YZ.