CAT 2023 Question Paper | Quant Slot 1

CAT 2023 Quant was dominated by Algebra followed by Arithmetic. In Arithmetic, the questions were dominated by topics like Speed-time-distance, Mixture and Alligations. This year, there was a surprise. The questions from Geometry were relatively on the lower side as compared to the previous years. There were 8 TITA Qs this year. Overall this section was at a medium level of difficulty.

Question 18 : A quadrilateral ABCD is inscribed in a circle such that AB : CD = 2 : 1 and BC : AD = 5 : 4. If AC and BD intersect at the point E, then AE : CE equals

Video Explanation

Explanatory Answer

$\angle D A C = \angle D B C$
(Angles subtended by the chord DC on the same side.)
$\angle A D B = \angle A C B$
(Angles subtended by the chord AB on the same side.)
$\angle A E D = \angle B E C$
(Vertically Opposite angles.)

Therefore, $\triangle A E D \sim \triangle B E C$
$\frac { A E } { B E } = \frac { E D } { E C } = \frac { A D } { B C } = \frac { 4 } { 5 }$
$\angle A B D = \angle A C D$
(Angles subtended by the chord AD on the same side.)
$\angle B A C = \angle B D C$
(Angles subtended by the chord BC on the same side.)
$\angle A E B = \angle D E C$
(Vertically Opposite angles.)

Therefore, $\triangle A E B \sim \triangle D E C$
$\frac { A E } { E D } = \frac { B E } { E C } = \frac { A B } { D C } = \frac { 2 } { 1 }$
$\frac { A E } { E D } \times \frac { E D } { E C } = \frac { 2 } { 1 } \times \frac { 4 } { 5 } = \frac { 8 } { 5 }$
Therefore, AE : EC = 8 : 5

The question is " A quadrilateral ABCD is inscribed in a circle such that AB : CD = 2 : 1 and BC : AD = 5 : 4. If AC and BD intersect at the point E, then AE : CE equals "

Hence, the answer is '8 : 5'

Choice C is the correct answer.

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