Atelier Ryza: Ever Darkness & the Secret Hideout

Algebra Level 1

The protagonist of the game Atelier Ryza: Ever Darkness & the Secret Hideout , Reisalin Stout, who wears red pants and shows off her legs and navel, has caught many people's eyes even before the game came out. Now we're looking for a way to estimate her height.

To make her look pretty, the designer had to carefully decide the ratios. Assume that the ratio of the length from her navel to the bottom of her feet and the length from the top of her head to her navel is equal to golden ratio ϕ = 5 + 1 2 \phi=\dfrac{\sqrt{5}+1}{2} . Besides, the ratio of the length from her throat to her navel and the length from the top of her head to her throat is also equal to ϕ \phi .

Given that her legs are 95 c m 95\ cm long and the length from the top of her head to her bottom of her neck is 24 c m 24\ cm , which could be a possible height for Reisalin Stout?

183 c m 183 \ cm 150 c m 150 \ cm 161 c m 161 \ cm 172 c m 172 \ cm

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1 solution

David Vreken
Apr 26, 2020

If her legs are 95 cm 95 \text{ cm} long, which is smaller than the length from her navel to the bottom of her feet, and the ratio of the length from her navel to the bottom of her feet and the length from the top of her head to her navel is ϕ \phi , then the length from the top of her head to her navel must be greater than 95 ϕ \frac{95}{\phi} , so that her whole height h h is h > 95 ϕ + 95 = 95 ϕ h > \frac{95}{\phi} + 95 = 95\phi or h > 153 cm h > 153 \text{ cm} .

If the length from the top of her head to her bottom of her neck is 24 cm 24 \text{ cm} long, which is greater than the length from the top of her head to her throat, and the ratio of the length from her throat to her navel and the length from the top of her head to her throat is ϕ \phi , then the length from her throat to her navel must be smaller than 24 ϕ 24\phi , which makes the length from the top of her head to her navel smaller than 24 ϕ + 24 24\phi + 24 , and since the ratio of the length from her navel to the bottom of her feet and the length from the top of her head to her navel is also ϕ \phi , then the length from her navel to the bottom of her feet is smaller than ( 24 ϕ + 24 ) ϕ (24\phi + 24)\phi , so that her whole height h h is h < ( 24 ϕ + 24 ) ϕ + ( 24 ϕ + 24 ) = 24 ( ϕ + 1 ) 2 h < (24\phi + 24)\phi + (24\phi + 24) = 24(\phi + 1)^2 or h < 165 cm h < 165 \text{ cm} .

Therefore, 153 cm < h < 165 cm 153 \text{ cm} < h < 165 \text{ cm} , and the only choice that fits this criteria is 161 cm \boxed{161 \text{ cm}} .

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