Square with 2 on a Side

Geometry Level 2

Consider a square A B C D ABCD with side length 2. Let E E be the midpoint of A B AB , F F the midpoint of B C BC , and P P and Q Q the points at which line segment A F \overline{AF} intersects D E \overline{DE} and D B \overline{DB} , respectively.

What is the area of E B Q P ? EBQP?

7 17 \frac{7}{17} 8 17 \frac{8}{17} 7 15 \frac{7}{15} 8 15 \frac{8}{15}

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2 solutions

Les Schumer
Jun 23, 2020

Let Vertex B be at coordinate (0,0), the equations for A F , E D \overline{AF}, \overline{ED} and D B \overline{DB} are y = 2 x + 2 , y = 1 2 x + 1 \\y=-2x+2, y=\frac{1}{2}x+1 and y = x y=x respectively \\ From here, the coordinates of P and Q are located at the intersections.

P such that 1 2 x + 1 = 2 x + 2 x = 2 5 \frac{1}{2}x+1=-2x+2 \rightarrow x=\frac{2}{5} and substituting back in gives y = 6 5 y=\frac{6}{5} , and

Q such that x = 2 x + 2 x = 2 3 x=-2x+2 \rightarrow x=\frac{2}{3} and substituting back gives y = 2 3 y=\frac{2}{3}\\

The Area E B Q P = A B F A E P B F Q = 1 2 ( 1 ) ( 2 ) 1 2 ( 1 ) ( 2 5 ) 1 2 ( 1 ) ( 2 3 ) = 1 1 5 1 3 = 7 15 EBQP = ABF - AEP - BFQ = \frac{1}{2}(1)(2) - \frac{1}{2}(1)(\frac{2}{5}) - \frac{1}{2}(1)(\frac{2}{3}) = 1-\frac{1}{5}-\frac{1}{3} = \boxed{\frac{7}{15}}

Anurag Mn
Jul 25, 2019

7/15

This can't be just level 2 geometry problem!

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