Recap: Finding an Angle

Part of the Right-Triangle Trigonometry section of Coddy's Trigonometry journey. Lesson 24 of 46.

Challenge

Triangle DEF has a right angle at D. For the angle θ at E, the adjacent side is 7 and the hypotenuse is 25. Find θ in degrees, rounded to two decimal places. Then press Check.

Try it yourself

$Use the figure to find theta$

Use the figure to find theta

All lessons in Right-Triangle Trigonometry

1Measuring With an Angle

How Tall Is the Tree?Naming the Sides The Tangent Ratio

4Finding the Hypotenuse

The Unknown Below the Bar How Long Is the Kite String?A Leg Below the Bar Is the Answer Sensible?Recap: The Hypotenuse

7Elevation and Depression

Angle of Elevation Measuring From Eye Level Angle of Depression The Sun's Angle Two Triangles, One Height Recap: Looking Up and Down

2The Three Ratios

The Sine Ratio The Cosine Ratio Choosing the Ratio Recap: The Three Ratios

5Finding an Angle

Inverse Sine Inverse Cosine Inverse Tangent The Angle of a Ramp Both Acute AnglesRecap: Finding an Angle

8Reciprocal Ratios

Cosecant, Secant, Cotangent Exact Reciprocal Values A Side From a Cosecant A Ladder and a Secant Recap: Reciprocal Ratios

3Finding a Side

Sides at Any Angle Rounding the Answer Tangent: Leg From Leg A Ladder Against a Wall The Other Acute Angle Recap: Finding a Side

6Special Triangles, Exactly

The Two Special Triangles An Exact Hypotenuse The Side Next to 30°An Exact Angle Recap: Exact Values

9Final Challenges

Is the Ladder Safe?The Wheelchair Ramp Two Observers The Landing Plane The Kite The Sun's Angle, Exactly