ACT Math : How to find an angle in a hexagon

Study concepts, example questions & explanations for ACT Math

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Example Questions

Example Question #1 : How To Find An Angle In A Hexagon

The sum of all the angles inside of a regular hexagon is . Determine the value of one angle. 

Possible Answers:

Correct answer:

Explanation:

In a regular hexagon, all of the sides are the same length, and all of the angles are equivalent. The problem tells us that all of the angles inside the hexagon sum to . To find the value of one angle, we must divide  by , since there are  angles inside of a hexagon. 

Example Question #2 : How To Find An Angle In A Hexagon

Hexex11

All of the angles marked are exterior angles.

What is the value of  in degrees? Round to the nearest hundredth.

Possible Answers:

Correct answer:

Explanation:

There are two key things for a question like this. The first is to know that a polygon has a total degree measure of:

, where  is the number of sides.

Therefore, a hexagon like this one has:

.

Next, you should remember that all of the exterior angles listed are supplementary to their correlative interior angles. This lets you draw the following figure:

Hexex12

Now, you just have to manage your algebra well. You must sum up all of the interior angles and set them equal to . Since there are  angles, you know that the numeric portion will be  or . Thus, you can write:

Simplify and solve for :

This is  or .

Example Question #44 : Plane Geometry

Hexex21

The figure above is a hexagon.  All of the angles listed (except the interior one) are exterior angles to the hexagon's interior angles.

What is the value of ?

Possible Answers:

Correct answer:

Explanation:

There are two key things for a question like this. The first is to know that a polygon has a total degree measure of:

, where  is the number of sides.

Therefore, a hexagon like this one has:

.  

Next, you should remember that all of the exterior angles listed are supplementary to their correlative interior angles.  This lets you draw the following figure: 

Hexex22

Now, you just have to manage your algebra well. You must sum up all of the interior angles and set them equal to . Thus, you can write:

Solve for :

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