Half-Angle Formula Teacher Resources

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Half Angle Formulas: Half-Angle Formulas

For Students 10th - 12th
Slide the resource into your lesson plans. Young mathematicians use a slider to move a movie screen to the right position for optimal viewing. Along the way, they learn to apply the half angle formulas.
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Finding Exact Trigonometric Values Using Double Angle Identities: Trig Values Using Double and Half Angle Formulas

For Students 10th - 12th
The more you know, the more you can learn. Scholars apply the double angle and half angle formulas to determine trig values based on known values. They use an interactive that provides sine and cosine values to aid calculations.
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Half Angle Formula

For Students 9th - 11th
In this half angle formula worksheet, students use half angle formulas to find the value of given angles. This one-page worksheet contains 1 multi-step problems.
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Trigonometry Identity Review/Fun

For Students 10th - 12th
In this video, Sal derives a number of trigonometric identities. Starting with the sum of angles formula for sine and cosine, Sal proves a number of other identities including the double-angle formulas, the difference of angles formulas,...
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Double-Angle and Half-Angle Formulas

For Teachers 12th - Higher Ed
In this college level Pre-Calculus worksheet, students use the double-angle and half-angle formulas to evaluate trigonometric expressions and solve trigonometric equations. The six page worksheet contains fifty-six problems. Answers are...

Addition and Subtraction Formulas 2

For Teachers 11th - 12th Standards
Knowing the addition formulas allows for the calculations of double and half formulas. The fourth installment of 16 has the class use the addition formula to develop the double angle trigonometric formulas. Using the double formula,...

Mid-Module Assessment Task: Pre-Calculus Module 4

For Students 11th - 12th Standards
Challenge scholars to show what they know about properties and addition and subtraction formulas for trigonometric functions. The resource provides a mid-unit check on the progress toward mastery of trigonometric concepts. The areas...
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Half Angle

For Teachers 9th - 12th
Students calculate the solution using half angles formulas. In this calculus instructional activity, students identify the different properties of a triangle using trigonometric properties. They identify the mean, altitude and angles of...
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Worksheet 6.4 Double-Angle Formulas

For Students 10th - 12th
In this double-angle formula worksheet, students find the exact value of equations using double-angle formulas. Students use half-angle formulas to determine the value of sine, cosine and tangent of given angles. This two-page...
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Seven Circles III

For Teachers 9th - 11th Standards
A basic set-up leads to a surprisingly complex analysis in this variation on the question of surrounding a central circle with a ring of touching circles. Useful for putting trigonometric functions in a physical context, as well as...
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Math Handbook: Trigonometry

For Students 9th - 12th Standards
You'll be spinning in unit circles once you read through this jumbo-sized resource of everything you need to know about trigonometry. Each page has color-coded examples with explicit directions that detail the problems and formulas. 
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Angle Sum and Difference

For Students 11th
In this angle sum and difference worksheet, 11th graders solve 10 different problems related to determining the angle sum and difference of numbers. First, they determine the exact value of sine and cosine degrees. Then, students utilize...
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Identities and Trigonometric Values

For Teachers 9th - 11th
Students solve trigonometric equations. In this precalculus instructional activity, students prove trigonometric identities using the Pythagorean Theorem. They apply the addition formulas for sine and cosine to prove different identities.

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Half-Angle Formula