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

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

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Example Questions

Example Question #94 : Isee Upper Level (Grades 9 12) Quantitative Reasoning

Right_triangle

A regular hexagon has the same perimeter as the above right triangle. What is the length of one side of the hexagon?

Possible Answers:

\(\displaystyle 10 \frac{1}{3}\textrm{ in}\)

The length cannot be determined from the information given.

\(\displaystyle 12 \frac{2}{5}\textrm{ in}\)

\(\displaystyle 18 \frac{2}{3} \textrm{ in}\)

\(\displaystyle 22 \frac{2}{5} \textrm{ in}\)

Correct answer:

\(\displaystyle 18 \frac{2}{3} \textrm{ in}\)

Explanation:

By the Pythagorean Theorem, the hypotenuse of the right triangle is 

\(\displaystyle \sqrt{14^{2}+48^{2}} = \sqrt{196+2,304} = \sqrt{2,500} = 50\) inches, making its perimeter

\(\displaystyle 14 + 48 + 50 =112\) inches.

The regular hexagon, which has six sides of equal length, has the same perimeter, so each side measures

\(\displaystyle 112 \div 6 = 18 \frac{2}{3}\) inches.

Example Question #101 : Plane Geometry

Right_triangle

A regular hexagon has the same perimeter as the above right triangle. What is the length of one side of the hexagon?

Possible Answers:

\(\displaystyle 10 \frac{1}{3}\textrm{ in}\)

\(\displaystyle 22 \frac{2}{5} \textrm{ in}\)

\(\displaystyle 12 \frac{2}{5}\textrm{ in}\)

The length cannot be determined from the information given.

\(\displaystyle 18 \frac{2}{3} \textrm{ in}\)

Correct answer:

\(\displaystyle 18 \frac{2}{3} \textrm{ in}\)

Explanation:

By the Pythagorean Theorem, the hypotenuse of the right triangle is 

\(\displaystyle \sqrt{14^{2}+48^{2}} = \sqrt{196+2,304} = \sqrt{2,500} = 50\) inches, making its perimeter

\(\displaystyle 14 + 48 + 50 =112\) inches.

The regular hexagon, which has six sides of equal length, has the same perimeter, so each side measures

\(\displaystyle 112 \div 6 = 18 \frac{2}{3}\) inches.

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