You are given a regular hexagon that has side length 8. If you want to construct another regular hexagon with area , what is the ratio of the new hexagon's side length to the original hexagon's side length?
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Relevant wiki: Regular Polygons - Area
A regular hexagon with side length 8 has an area of 9 6 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 4 s 2 3 , and we plug in 8 for s to get the area 1 6 3 . Because a regular hexagon is made of 6 equilateral triangles, we get that the area of the hexagon is 6 × 1 6 3 = 9 6 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 in the area formula? If you divide the side length or an equilateral triangle by 4, we will end up with a triangle 1 6 1 as big since ( 4 1 ) 2 = 1 6 1 . So, in order to get a hexagon 4 1 as big, we need to find the square root of 4 1 , which is 1 2 in this case. That means the side length we want is 2 1 as big. Yippees! Our answer is 1 : 2 .