Engineering
Mathematics
A Circle
Question

A rectangle is inscribed in a circle with a diameter lying along the line 3y = x + 7. If the two adjacent vertices of the rectangle are (– 8, 5) and (6, 5), then the area of the rectangle (in sq. units) is

56

98

72

84

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Solution

Let vertex C is (6,k) then centre of circle

(1,5+k2)

It lies on diameter 3y = x + 7

3(5+k2)=1+7

⇒ k =–1

So, AB = 14 and BC = 6

Area = 14 × 6 = 84

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