ISEE Upper Level Math : How to find the length of the side of a hexagon

Study concepts, example questions & explanations for ISEE Upper Level Math

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Example Questions

Example Question #1 : How To Find The Length Of The Side Of A Hexagon

What is the sidelength, in feet and inches, of a regular hexagon with perimeter 16 feet?

Possible Answers:

\(\displaystyle 1 \textrm{ ft }4 \textrm{ in}\)

\(\displaystyle 3 \textrm{ ft }2 \frac{2}{5} \textrm{ in}\)

\(\displaystyle 2 \textrm{ ft }\)

\(\displaystyle 1 \textrm{ ft }7 \frac{1}{5} \textrm{ in}\)

\(\displaystyle 2 \textrm{ ft }8 \textrm{ in}\)

Correct answer:

\(\displaystyle 2 \textrm{ ft }8 \textrm{ in}\)

Explanation:

Divide the perimeter 16 feet by 6 to get the sidelength of the hexagon in feet:

\(\displaystyle 16 \div 6 = 2\frac{2}{3} \textrm{ ft }\)

Two-thirds of a foot is equal to eight inches, so this sidelength is 2 feet 8 inches.

Example Question #1 : How To Find The Length Of The Side Of A Hexagon

The perimeter of a regular hexagon is one mile. Give the sidelength in feet.

Possible Answers:

\(\displaystyle 660 \textrm{ ft}\)

\(\displaystyle 1,320 \textrm{ ft}\)

\(\displaystyle 880 \textrm{ ft}\)

\(\displaystyle 330 \textrm{ ft}\)

\(\displaystyle 990 \textrm{ ft}\)

Correct answer:

\(\displaystyle 880 \textrm{ ft}\)

Explanation:

One mile is equal to 5,280 feet, so divide this by 6:

\(\displaystyle 5,280 \div 6 = 880\) feet

Example Question #2 : Hexagons

A hexagon has a perimeter of 114in. Find the length of one side.

Possible Answers:

\(\displaystyle 20\text{in}\)

\(\displaystyle 22\text{in}\)

\(\displaystyle 17\text{in}\)

\(\displaystyle 19\text{in}\)

\(\displaystyle 12\text{in}\)

Correct answer:

\(\displaystyle 19\text{in}\)

Explanation:

A hexagon has 6 equal sides.  The formula to find perimeter of a hexagon is:

\(\displaystyle P = 6a\)

where a is the length of any side.  Now, to find the length of one side, we will solve for a

 

We know the perimeter of the hexagon is 114in.  So, we will substitute and solve for a.  We get

\(\displaystyle 114\text{in} = 6a\)

 

\(\displaystyle \frac{114\text{in}}{6} = \frac{6a}{6}\)

 

\(\displaystyle 19\text{in} = a\)

 

\(\displaystyle a = 19\text{in}\)

Therefore, the length of one side of the hexagon is 19in.

Example Question #1 : Hexagons

The perimeter of a hexagon is 96cm. Find the length of one side.

Possible Answers:

\(\displaystyle 13\text{cm}\)

\(\displaystyle 16\text{cm}\)

\(\displaystyle 14\text{cm}\)

\(\displaystyle 19\text{cm}\)

\(\displaystyle 18\text{cm}\)

Correct answer:

\(\displaystyle 16\text{cm}\)

Explanation:

A hexagon has 6 equal sides. To find the length of one side of a hexagon, we will use the formula to find the perimeter.  

\(\displaystyle P = 6a\)

where a is the length of one side. So, we will solve for a.

Now, we know the perimeter of the hexagon is 96cm. So, we get

\(\displaystyle 96\text{cm} = 6a\) 

\(\displaystyle \frac{96\text{cm}}{6} = \frac{6a}{6}\)

\(\displaystyle 16\text{cm} = a\)

\(\displaystyle a = 16\text{cm}\)

Therefore, the length of one side of the hexagon is 16cm.

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