Unit A: Geometry

Chapter 1: Polygons

Practice

Instructions: Click the Download File button to download a printable PDF of the questions. Answer each of the following practice questions on a separate piece of paper. Step by step solutions are provided under the Solutions tab. You will learn the material more thoroughly if you complete the questions before checking the answers.

Practice
Solutions

1.

Determine the sum of the interior angles of a 13-sided figure without making a sketch.

2.

Determine the sum of the interior angles of a 22-sided figure.

1.

Determine the sum of the interior angles of a 13-sided figure without making a sketch.

Hint: Substitute 13 in for n.

\begin{array}{rcl} S & = & 180 ° (n - 2) \\ = & 180 ° (13 - 2) \\ = & 180 ° (11) \\ = & 1 980 ° \end{array}

2.

Determine the sum of the interior angles of a 22-sided figure.

\begin{array}{rcl} S & = & 180 ° (n - 2) \\ = & 180 ° (22 - 2) \\ = & 180 ° (20) \\ = & 3 600 ° \end{array}