Geometry of Love

Geometry Level 4

A boy named Alex plans to give a rose with a beautiful ring to his sweetheart Rosie.

But Rosie likes a specific kind of rose with a ring such that -

If the rose is considered as a 2-D circle , the ring is a point R R with coordinates ( 3 , 5 ) (-3 , -5) , the power of the point R R (ring) is '101' with respect to the circle(rose). [2- D Geometry]

Alex collects 5 roses with one ring each with coordinates ( 3 , 5 ) (-3 , -5) and opts to select the appropriate rose, which his sweetheart Rosie would like on Valentine's Day.

The collected roses had the following equations:

Rose R : x 2 + y 2 2 x 4 y + 9 = 0 x^2 + y^2 - 2x - 4y + 9 = 0

Rose O : x 2 + y 2 4 x 6 y + 9 = 0 x^2 + y^2 - 4x - 6y + 9 = 0

Rose S : x 2 + y 2 6 x 8 y + 9 = 0 x^2 + y^2 - 6x - 8y + 9 = 0

Rose I : x 2 + y 2 8 x 10 y + 9 = 0 x^2 + y^2 - 8x - 10y + 9 = 0

Rose E : x 2 + y 2 10 x 12 y + 9 = 0 x^2 + y^2 - 10x - 12y + 9 = 0

You have to help Alex to select the right rose for his valentine. Which one will you suggest?

Bonus question : Alex and Rosie are the main romantic characters in a film released in 2014. What is the name of this film?

Image Credit: Wikimedia Hamachidori
Rose R Rose O Rose S Rose I Rose E

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3 solutions

Nihar Mahajan
Feb 2, 2015

The name of the film is 'Love, Rosie'.

Power of point R(-3 , -5) with respect to circle of rose S

= (-3)^2 + (-5)^2 - 6(-3) - 8(-5) + 9

= 9 + 25 + 18 + 40 + 9

= 101 :)

Hence rose 'S' is the appropriate one.

Don' underestimate the power of a ring along with a rose :P :D :)

snipe level : succes

math man - 6 years, 4 months ago

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halo,indonesia juga ya hehe

Rifqi Mukhammad - 6 years, 2 months ago

Square of length of tangents from (-3, -5) to the circle ( x 3 ) 2 + ( x 4 ) 2 = 4 2 . (x -3)^2 + (x - 4)^2 = 4^2.

Lu Chee Ket - 5 years, 5 months ago
Chenyang Sun
Mar 28, 2015

Had to try them out until circle R... I feel like there is a pun that I missed. What is it?

Titas Biswas
Feb 13, 2015

Rosie is a jewel in geometry!

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