Unit A: Geometry

Chapter 3: Trigonometry

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.

Use a calculator to find

∠ A

to the nearest degree.

a.

cos A=0.3456

b.

cos A = –0.7598

1.

Use a calculator to find

∠ A

to the nearest degree.

a.

cos A = 0.3456

b.

cos A = –0.7598

a.

\begin{array}{rcl} ∠ A & = & \cos^{- 1} 0.3456 \\ = & 70 ° \end{array}

b.

\begin{array}{rcl} ∠ A & = & \cos^{- 1} (- 0.7598) \\ = & 139 ° \end{array}

If you are unable to calculate these values, STOP and contact your teacher.