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CBSE Class 9 Answered

OPQR is a rhombus, whose vertices P,Q,R lie on a circle with centre O . If radius of the circle is 12 cm. Find the area of the rhombus
Asked by Jai Khurana | 29 Jun, 2013, 12:32: PM
Expert Answer

Draw a circle with center O. And then, draw a rhombus OPQR inside the circle such that its one vertice lies on the center of the circle and the other 3 lie on the circumference of the circle. 

The diagonal OQ would split the triangle in 2 congruent triangles. Moreover, we can prove that triangles OPQ and ORQ are equilateral (with each side equal to radius).

We know that one diagonal of the rhombus = OQ = r

The length of other diagonal = 2 * altitude of the equilateral triangle ORQ = root 3 * r

Now area of rhombus with diagonals d1 and d2 = 1/2. d1 * d2

Hence, (1/2). r . root 3 * r = Area

Since r = 12cm

Hence, area = root(3)/2 *12*12 = 72 root(3) cm^2

Answered by | 29 Jun, 2013, 05:22: PM
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