Try this beautiful problem from Singapore Mathematical Olympiad. 2013 based on the area of Square.
Let ABCD be a square and X and Y be points such that the lengths of XY, AX, and AY are 6,8 and 10 respectively. The area of ABCD can be expressed as \(\frac{m}{n}\) units where m and n are positive integers without common factors. Find the value of m+n.
2D Geometry
Area of Square
But try the problem first...
Answer: 1041
Singapore Mathematical Olympiad - 2013 - Junior Section - Problem Number 17
Challenges and Thrills -
First hint
This can the very first hint to start this sum:
Assume the length of the side is a.
Now from the given data we can apply Pythagoras' Theorem :
Since, \(6^2+8^2 = 10^2\)
so \(\angle AXY = 90^\circ\).
From this, we can understand that \(\triangle ABX \) is similar to \(\triangle XCY\)
Try to do the rest of the sum........................
Second Hint
From the previous hint we find that :
\(\triangle ABX \sim \triangle XCY\)
From this we can find \(\frac {AX}{XY} = \frac {AB}{XC} \)
\(\frac {8}{6} = \frac {a}{a - BX}\)
Can you now solve this equation ?????????????
Final Step
This is the very last part of this sum :
Solving the equation from last hint we get :
a = 4BX and from this we can compute :
\(8^2 = {AB}^2 +{BX}^2 = {16BX}^2 + {BX}^2 \)
so , \( BX = \frac {8}{\sqrt {17}} and \(a^2 = 16 \times \frac {64}{17} = \frac {1024}{17}\)
Thus m + n = 1041 (Answer).