SSAT Upper Level Math : How to find the perimeter of a hexagon

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

varsity tutors app store varsity tutors android store

Example Questions

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

A regular hexagon has perimeter 9 meters. Give the length of one side in millimeters.

Possible Answers:

\displaystyle 1,200\textrm{ mm }

\displaystyle 2,000\textrm{ mm }

\displaystyle 1,500 \textrm{ mm }

\displaystyle 1,800\textrm{ mm }

\displaystyle 2,400 \textrm{ mm }

Correct answer:

\displaystyle 1,500 \textrm{ mm }

Explanation:

One meter is equal to 1,000 millimeters, so the perimeter of 9 meters can be expressed as:

9 meters = \displaystyle 9 \times 1,000 = 9,000 millimeters.

Since the six sides of a regular hexagon are congruent, divide by 6:

\displaystyle 9,000 \div 6 = 1,500 millimeters.

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

A hexagon with perimeter 60 has four congruent sides of length \displaystyle t+1. Its other two sides are congruent to each other. Give the length of each of those other sides in terms of \displaystyle t.

Possible Answers:

\displaystyle 56-2t

\displaystyle 28+2t

\displaystyle 28-2t

\displaystyle 28-t

\displaystyle 56+2t

Correct answer:

\displaystyle 28-2t

Explanation:

The perimeter of a polygon is the sum of the lengths of its sides. Let:

\displaystyle x= Length of one of those other two sides

Now we can set up an equation and solve it for \displaystyle x in terms of \displaystyle t:

\displaystyle 2x+4(t+1)=60

\displaystyle \Rightarrow 2x+4t+4=60

\displaystyle \Rightarrow 2x=60-4-4t

\displaystyle \Rightarrow 2x=56-4t

\displaystyle \Rightarrow x=28-2t

 

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

Two sides of a hexagon have a length of \displaystyle t, two other sides have the length of \displaystyle t-1, and the rest of the sides have the length of \displaystyle t+1. Give the perimeter of the hexagon.

Possible Answers:

\displaystyle 8t+8

\displaystyle 6t-6

\displaystyle 6t

\displaystyle 6t+6

\displaystyle 8t

Correct answer:

\displaystyle 6t

Explanation:

The perimeter of a polygon is the sum of the lengths of its sides. So we can write:

\displaystyle Perimeter=2\left [ t+(t+1)+(t-1) \right ]=2(3t)=6t

Example Question #3 : How To Find The Perimeter Of A Hexagon

A regular hexagon has perimeter 15 feet. Give the length of one side in inches.

Possible Answers:

\displaystyle 15

\displaystyle 30

\displaystyle 18

\displaystyle 24

\displaystyle 36

Correct answer:

\displaystyle 30

Explanation:

As the six sides of a regular hexagon are congruent, we can write:

\displaystyle Perimeter=6a=15\Rightarrow a=2.5 feet; \displaystyle a is the length of each side.

One feet is equal to 12 inches, so we can write:

\displaystyle a=2.5\times 12=30 inches

Example Question #1 : Areas And Perimeters Of Polygons

Each interior angle of a hexagon is 120 degrees and the perimeter of the hexagon is 120 inches. Find the length of each side of the hexagon.

Possible Answers:

\displaystyle 60\ inches

\displaystyle 10\ inches

\displaystyle 30\ inches

\displaystyle 25\ inches

\displaystyle 20\ inches

Correct answer:

\displaystyle 20\ inches

Explanation:

Since each interior angle of a hexagon is 120 degrees, we have a regular hexagon with identical side lengths. And we know that the perimeter of a polygon is the sum of the lengths of its sides. So we can write:

\displaystyle Perimeter=6a=120\Rightarrow a=20 inches

Example Question #2 : How To Find The Perimeter Of A Hexagon

A hexagon with perimeter of 48 has three congruent sides of \displaystyle 2t+3. Its other three sides are congruent to each other with the length of \displaystyle 2t-7. Find \displaystyle t.

Possible Answers:

\displaystyle 5

\displaystyle 3

\displaystyle 6

\displaystyle 4

\displaystyle 2

Correct answer:

\displaystyle 5

Explanation:

The perimeter of a polygon is the sum of the lengths of its sides. Since three sides are congruent with the length of \displaystyle 2t+3 and the rest of the sides have the length of \displaystyle 2t-7 we can write:

 

\displaystyle Perimeter=3(2t+3)+3(2t-7)=48

Now we should solve the equation for \displaystyle t:

\displaystyle 6t+9+6t-21=48\Rightarrow 12t-12=48\Rightarrow 12t=60\Rightarrow t=5

Example Question #6 : Areas And Perimeters Of Polygons

A regular pentagon has sidelength one foot; a regular hexagon has sidelength ten inches. The perimeter of a regular octagon is the sum of the perimeters of the pentagon and the hexagon. What is the measure of one side of the octagon?

Possible Answers:

\displaystyle 15 \textrm{ in }

\displaystyle 10 \textrm{ in }

\displaystyle 16 \textrm{ in }

\displaystyle 18 \textrm{ in }

\displaystyle 12 \textrm{ in }

Correct answer:

\displaystyle 15 \textrm{ in }

Explanation:

A regular polygon has all of its sides the same length. The pentagon has perimeter \displaystyle 5 \times 12 \textrm{ in } = 60 \textrm{ in }; the hexagon has perimeter \displaystyle 6 \times 10 \textrm{ in } = 60 \textrm{ in }. The sum of the perimeters is \displaystyle 60 \textrm{ in } + 60 \textrm{ in }= 120 \textrm{ in }, which is the perimeter of the octagon; each side of the octagon has length \displaystyle 120 \textrm{ in } \div 8 = 15 \textrm{ in }.

Example Question #5 : Areas And Perimeters Of Polygons

Find the perimeter of a hexagon with a side length of \displaystyle 6a+b.

Possible Answers:

\displaystyle 6a+6b

\displaystyle 12a+6b

\displaystyle 36a+6b

\displaystyle 36a+36b

\displaystyle 36a+b

Correct answer:

\displaystyle 36a+6b

Explanation:

A hexagon has six sides.  The perimeter of a hexagon is:

\displaystyle P=6s

Substitute the side length.

\displaystyle P=6s=6(6a+b)=36a+6b

Learning Tools by Varsity Tutors