Make it bigger

Geometry Level 3

You are given a regular hexagon that has side length 8. If you want to construct another regular hexagon with area 24 3 24\sqrt{3} , what is the ratio of the new hexagon's side length to the original hexagon's side length?

1 : 2 1:2 1 : 3 1:3 1 : 64 1:64 2 : 1 2:1 4 : 1 4:1

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1 solution

Margaret Zheng
Apr 14, 2016

Relevant wiki: Regular Polygons - Area

A regular hexagon with side length 8 has an area of 96 3 96\sqrt{3} . To calculate its area, first divide it into six identical equilateral triangles . Now, let's first find the area of one triangle. The area of an equilateral triangle is s 2 3 4 \frac{s^{2}\sqrt{3}}{4} , and we plug in 8 for s s to get the area 16 3 16\sqrt{3} . Because a regular hexagon is made of 6 equilateral triangles, we get that the area of the hexagon is 6 × 16 3 = 96 3 6 \times 16\sqrt{3} = 96\sqrt{3} .

It is 4 times as big as the hexagon we would like to construct. So why would you not just divide 8 by 4?

Well, see the s 2 s^{2} in the area formula? If you divide the side length or an equilateral triangle by 4, we will end up with a triangle 1 16 \frac{1}{16} as big since ( 1 4 ) 2 = 1 16 (\frac{1}{4})^{2} = \frac{1}{16} . So, in order to get a hexagon 1 4 \frac{1}{4} as big, we need to find the square root of 1 4 \frac{1}{4} , which is 12 {1}{2} in this case. That means the side length we want is 1 2 \frac{1}{2} as big. Yippees! Our answer is 1 : 2 \boxed{1:2} .

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