Stubborn Rectangle

ABCD is a rectengle.AEBDAE \perp BD and CFBDCF \perp BD.Let AE=x unit,ED=BF=y unit and OE=OF=z unit.AB=88 unit;BC=66 unit.What is the value of (x+y+z)2\left \lfloor (x+y+z)^2 \right \rfloor

Note by Fazla Rabbi
5 years, 7 months ago

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Well this problem looks simple First we see by Pythagoras theorem in triangle ADBADB that BD=10BD=10 So We conclude that y+z=10/2=5y+z=10/2=5 Now area of triangle ADBADB is 24 So 24=12×BD×AE24=\frac{1}{2}×BD×AE i.e.24=12×10×AE24=\frac{1}{2}×10×AE i.e. AE=4810AE=\frac{48}{10} So we get what we desire

Dinesh Chavan - 5 years, 7 months ago

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The diagonals of a rectangle bisect each other. Furthermore, by Pythagorean's theorem, AC=10AC = 10, so AO=DO=5AO = DO = 5. Using these same results, we get

y+z=5y + z = 5

x2+z2=25x^2 + z^2 = 25

x2+y2=36x^2 + y^2 = 36

Subtracting the last two equations we get y2z2=11y^2 - z^2 = 11, so (yz)(y+z)=11(y - z)(y+z) = 11. Substituting the first equation, we get yz=115y-z = \frac{11}{5}. Doing a linear combination with y+z=5y+z = 5 we get 2y=3652y = \frac{36}{5} so y=185y = \frac{18}{5} and z=75z = \frac{7}{5}. Using one of the equations to find xx we get that (x+y+z)2=(495)2=240125(x+y+z)^2 = (\frac{49}{5})^2 = \frac{2401}{25}, and the greatest integer less than or equal to that is 9696.

Motivations in this problem: Nothing really too fancy, just finding what we're given using pythagorean's theorem (which should be obvious given the right angles and side lengths of 66 and 88) and then solving a system of equations.

Michael Tong - 5 years, 7 months ago

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Wow nice approach. Thanks for one more method.

Dinesh Chavan - 5 years, 7 months ago

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(24/5 + 5)^2

pulkit kogta - 5 years, 7 months ago

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I thnk answer is 96.04 In triangle ABC = AB^2 + BC^2 = AC^2 64 + 36 = 100 AC = 10 AC = BD = 10 then 2(y+z) = 10 y+z = 5 z = 5-y (1) AD = BC= 6 then AD^2 = DE2 + AE2 36 = X2 + Y2 (2) In Triangle AOE and COF OE = OF ANGLE AEO = ANGLE CFO ANGLE AOE = ANGLE COF TRIANGLE AOE CONGRUENT TO TRIANGLE COF THEN AO = OC so AC= 10 then AO = 5 Also In Triangle AOE AO2 = AE2+OE2 25 = x2 + z2 (3) 25 = x2 + (y-5)2 25 = x2 + y2 + 25 - 10y 0 = x2+y2 - 10y(4) subtracting 4 from 2 we get 10y = 36 y = 3.6 from (1) we get z = 1.4 putting value of z in 3rd equation we get 25 = x2 + 1.96 x2 = 23.04 x = 4.8 x+y+z = 1.4+3.6+4.8 = 9.8 (x+y+z)2 = (9.8)2 = 96 .04

Azhar Ahmad - 5 years, 7 months ago

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Ans is 96.04

Achint Gupta - 5 years, 7 months ago

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96.04

Andrew Tiu - 5 years, 7 months ago

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(9.8)^2 means 96.04 is the answer.

Rubayet Tusher - 5 years, 7 months ago

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96.04

Azizul Islam - 5 years, 7 months ago

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answer is 96.04 as here BO=5cm and area boc=68/4=12=1/25*x this means x=24/5=4.8 so value=(5+4.8)square=(9.8)square=96.04

Vishudh Nagpal - 5 years, 7 months ago

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96.04 is the ans

Rohan Kumar - 5 years, 7 months ago

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96.04

Archana Panigrahi - 5 years, 7 months ago

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96.04

Magdy Essafty - 5 years, 7 months ago

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96.04

rakesh kumar - 5 years, 7 months ago

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96.04

Liên Lee - 5 years, 7 months ago

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correct ans : 96.04

Yash Bhansali - 5 years, 7 months ago

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my answer is 96.04

Andy Leonardo - 5 years, 7 months ago

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In triangle ADB, by using Pythagoras theorem, we can say that BD=10.Area of triangle ABD=24=1/2(10)(AE), thus, AE=x=4.8.And as O is the mid-point of BD, DO=z+y=5. Therefore, (x+y+z)^2=(4.8+5)^2=96.04

Subramaniam Sivasailam - 5 years, 7 months ago

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(x+y+z)power2 =100

Abdo Hamdy - 5 years, 7 months ago

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true

Abdo Hamdy - 5 years, 7 months ago

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2z+2y=10 & (z+y=5) _(1) ((2z+y)^2)+(x^2)=64 4z^2+y^2+4yz+x^2=64 ((5-z)^2 -z^2=11 25+z^2-10z=11 z=7/5 y=(18/5) x=(24/5) z+y+x=(7/5)+(18/5)+(24/5)) z+x+y=10

(z+x+y)^2=100 unit

Abdo Hamdy - 5 years, 7 months ago

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true

Abdo Hamdy - 5 years, 7 months ago

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SOLVE THIS PROBLEM

Brajesh Raj - 5 years, 7 months ago

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SOLVE THIS PROBLEM

Brajesh Raj - 5 years, 7 months ago

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96.04

Srinjoy Mukherjee - 5 years, 7 months ago

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96.04

Anupam Gahoi - 5 years, 7 months ago

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96.04

Ashutosh Singh - 5 years, 7 months ago

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96.04

Ashutosh Singh - 5 years, 7 months ago

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96.04

Khaled Saeed - 5 years, 7 months ago

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96.04

Gamal Adli - 5 years, 7 months ago

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121

Naila Rahma Jamilah - 5 years, 5 months ago

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The answer is 289

Muh. Amin Widyatama - 5 years, 7 months ago

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121

Joyce Yeo - 5 years, 7 months ago

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96 should b d answer

ratnesh kumar - 5 years, 7 months ago

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2401/25

Hassan Bohra - 5 years, 7 months ago

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ans is 84

Suvadip Sana - 5 years, 7 months ago

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