Year 10 Interactive Maths - Second Edition

Using the Cosine Ratio

Example 5

Find the value of the pronumeral in the following diagram, correct to 2 decimal places.

Solution:

Example 6

Find the length of the hypotenuse in the following diagram, correct to 2 decimal places.

Solution:

Let the length of the hypotenuse be x cm.

So, the length of the hypotenuse is 109.45 cm.

Study Another Topic in Chapter 15: Trigonometry

[ Naming the Sides of a Right-Angled Triangle ] [ Finding Side-Lengths ] [ Using the Cosine Ratio ] [ Using the Tangent Ratio ] [ Using a Graphics Calculator ] [ Finding Angles ] [ Using Inverse Cosine ] [ Using Inverse Tangent ] [ Problem Solving ] [ Composite Figures ] [ Directions and Bearings ] [ Angles of Elevation and Depression ] [ Three-Dimensional Problems ] [ Problem Solving Unit ] [ Projects ] [ Symbols ] [ Index ]