There are six sets of Trigonometry worksheets:

- Sin, Cos, Tan
- Sin & Cos of Complementary Angles
- Find Missing Sides
- Find Missing Angles
- Area of Triangle using Sine
- Law of Sines and Cosines

In these free math worksheets, students learn to find missing angles in right triangles using Trigonometry.

There are two sets of find missing angles worksheets:

Find missing angles of triangles

Missing angles word problems

**How to find missing angles using Trigonometry?**

Trigonometric functions have inverse functions known as arcsin (or inverse sine), arccos (or inverse cosine), and arctan (or inverse tangent). These inverse functions are denoted as sin^{-1}, cos^{-1}, and tan^{-1}, respectively. These functions help find angles when you know certain trigonometric ratios.

**Arcsin**

The arcsin function, also known as the inverse sine function, is the inverse of the sine function. It takes a number between -1 and 1 as input and returns the angle whose sine is equal to that number. For example, arcsin(0.5) = 30 degrees, because sin(30 degrees) = 0.5.

**Arccos**

The arccos function, also known as the inverse cosine function, is the inverse of the cosine function. It takes a number between -1 and 1 as input and returns the angle whose cosine is equal to that number. For example, arccos(0.866) = 30 degrees, because cos(30 degrees) = 0.866.

**Arctan**

The arctan function, also known as the inverse tangent function, is the inverse of the tangent function. It takes a number as input and returns the angle whose tangent is equal to that number. The arctan function can take any real number as input, but its output will always be between -90 degrees and 90 degrees. For example, arctan(1) = 45 degrees, because tan(45 degrees) = 1.

Have a look at this video if you need to review how to find missing angles in right triangles.

Click on the following worksheet to get a printable pdf document.

Scroll down the page for more **Trigonometry (Missing Angles) Worksheets**.

**Printable**

(Answers on the second page.)

Missing Angles Worksheet #1

Missing Angles Worksheet #2

**Online**

Trigonometry (sine, cosine, tangent)

Trigonometry (sine, cosine, tangent)

Trigonometry (using a calculator)

Inverse Trigonometry (using a calculator)

Trigonometry (find an unknown side)

Trigonometry (find an unknown angle)

Using Sine

Using Cosine

Using Tangent

Using Sine, Cosine or Tangent

Trigonometry Applications Problems

Law of Sines or Sine Rule

Law of Sines

Law of Cosines or Cosine Rule

Law of Cosines

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