Inscribed Squares Ratio

XAT 2014 · Quantitative Ability & Data Interpretation · Medium · Geometry

There are two squares S1S_1 and S2S_2 with areas 8 and 9 units, respectively. S1S_1 is inscribed within S2S_2, with one corner of S1S_1 on each side of S2S_2. The corners of the smaller square divides the sides of the bigger square into two segments, one of length 'a' and the other of length 'b', where b>ab > a. A possible value of 'b/a', is:

  1. A.

    ≥ 5 and < 8

  2. B.

    ≥ 8 and < 11

  3. C.

    ≥ 11 and < 14

  4. D.

    ≥ 14 and < 17

  5. E.

    17

Answer

D

Explanation

Side of S2=3  ⟹  a+b=3S_2 = 3 \implies a + b = 3. Side of S1=8=22  ⟹  a2+b2=8S_1 = \sqrt{8} = 2\sqrt{2} \implies a^2 + b^2 = 8. a2+(3−a)2=8  ⟹  2a2−6a+1=0  ⟹  a=3−72,b=3+72a^2 + (3-a)^2 = 8 \implies 2a^2 - 6a + 1 = 0 \implies a = \frac{3 - \sqrt{7}}{2}, b = \frac{3 + \sqrt{7}}{2}. ba=3+73−7=(3+7)22=8+37≈8+7.937=15.93\frac{b}{a} = \frac{3 + \sqrt{7}}{3 - \sqrt{7}} = \frac{(3+\sqrt{7})^2}{2} = 8 + 3\sqrt{7} \approx 8 + 7.937 = 15.93.

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