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Question

In the adjoining figure, points A, B, C and D lie on the circle, AD = 24 and BC = 12. What is the ratio of the area of triangle ΔCBE to that of the triangle ΔADE ? (CAT 1997)


A
1:4
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B
1:2
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C
1:3
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D
data insufficient
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Solution

The correct option is A 1:4

(b) In ΔCBE and ΔADE

CBA = CDA

(a chord of a circle subtends equal angle an all its circumference)

Similarily BCD = BAD and BEC = AED

(opp. angles)

Therefore ΔCBE ΔADE (AAA similarity rule)

Now BCDA=1224=12 Thus, ratios of areas = 1:4,

since Ratio of Areas of 2 similar triangles = Ratio of squares of the corresponding sides


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