Excel in math and science.

Join using Facebook Join using Google

Join using email

Forgot password? New user? Sign up

Existing user? Log in

Your answer seems reasonable. Find out if you're right!

That seems reasonable. Find out if you're right!

Join using Facebook Join using Google

Join using email

Forgot password? New user? Sign up

Existing user? Log in

Geometry

Regular Polygons

Concept Quizzes

Regular Polygons Warmup
Regular Polygons - Angles
Regular Polygons - Area
Regular Polygons - Properties of Regular Polygons
Regular Polygons - Properties of Regular Hexagons
Regular Polygons - Problem Solving
Regular Polygons - Decomposition into Triangles

Challenge Quizzes

Regular Polygons: Level 1 Challenges
Regular Polygons: Level 3 Challenges
Regular Polygons: Level 4 Challenges

Regular Polygons - Problem Solving

$\triangle ABC$ is a regular triangle with side length $6.$ If a triangle $\triangle BDE$ is cut from $\triangle ABC$ , where the length of $\overline{DB}$ and $\overline{EB}$ are both equal to $1$ , what is the perimeter of remaining figure $ADEC?$

14 17 16 15

Show explanation

View wiki

by Brilliant Staff

Which of the following facts about regular polygons is false?

All of the interior angles have the same measure. The sum of all the interior angles in a regular polygon of degree

11

1620^{\circ}.

It is possible for an interior angle to be bigger than

180^{\circ}

in a regular polygon. The lengths of all the edges are the same.

Show explanation

View wiki

by Brilliant Staff

$ABCD$ is a square. The point $E$ is located within $ABCD$ , such that $ABE$ is an equilateral triangle. What is the measure (in degrees) of $\color{#D61F06} {\angle \text{CBE} }$ ?

Show explanation

View wiki

by Brilliant Staff

Consider a polygon with $n$ vertices such that all internal angles are obtuse. If the sum of $n-1$ angles in this polygon is $973^{\circ},$ what is the last angle in degrees?

117 97 127 107

Show explanation

View wiki

by Brilliant Staff

A regular polygon has interior angles of $150^\circ$ . $A, B, C, D$ are 4 consecutive points of this polygon. What is the measure (in degrees) of $\angle ADC?$

Show explanation

View wiki

by Brilliant Staff