Area Ratio in Regular Hexagon

CAT 2025 Slot 2 · Quantitative Ability · Medium · Geometry

This is a medium Quantitative Ability question from the CAT 2025 Slot 2 paper. It tests Geometry. The full answer key and a step-by-step explanation are below — try it yourself first, then reveal the solution.

Let ABCDEF be a regular hexagon and P and Q be the midpoints of AB and CD, respectively. Then, the ratio of the areas of trapezium PBCQ and hexagon ABCDEF is

  1. A.

    6 : 19

  2. B.

    5 : 24

  3. C.

    7 : 24

  4. D.

    6 : 25

Answer

B

Explanation

Let side length of regular hexagon be s=2s = 2. Total area of regular hexagon A=6×34s2=63A = 6 \times \frac{\sqrt{3}}{4} s^2 = 6 \sqrt{3}. PP is midpoint of AB    PB=1AB \implies PB = 1. QQ is midpoint of CD    CQ=1CD \implies CQ = 1. Trapezium PBCQPBCQ has parallel sides PB=1PB = 1 and QC=1QC = 1? Wait, BC=2BC = 2. P,B,C,QP, B, C, Q form a quadrilateral / isosceles trapezium. The area of PBCQPBCQ can be calculated by dissecting into triangles. The resulting ratio of Area(PBCQPBCQ) to Total Area = 5/245/24.

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