Half Angle: Rule, Formula & Examples


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question 1 of 3

To find cos 15o with a half-angle formula, use

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1. To find sin 135o with a half-angle formula, use

2. 310o is in which quadrant?

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About This Quiz & Worksheet

The questions on this quiz will challenge you to answer several practice problems involving half-angle formulas. You'll need to solve several problems and understand the rules involving square roots and graph quadrants.

Quiz & Worksheet Goals

The questions in this quiz will ask you to:

  • Know the square root sign and angle needed to find cos 15o
  • Identify the square root sign and angle needed to find sin 135o
  • Understand which quadrant 310o is located in
  • Determine which value is the same as cos 410 o
  • Assess what's needed to choose the correct square root sign in a half-angle formula

Skills Practiced

Skills practiced include:

  • Problem solving - use acquired knowledge to solve half-angle practice problems
  • Knowledge application - use your knowledge of the half-angles to understand what's needed to choose the right square root sign
  • Reading comprehension - ensure you draw the most important information on the related lesson on half-angle formulas

Additional Learning

To get more information on this mathematical concept, read the related lesson called Half Angle: Rule, Formula & Examples. You'll cover the following learning objectives:

  • Look at 5 half-angle formulas
  • Define sign rules for each quadrant
  • Practice using half-angle formulas in four different example problems