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Sine Ratio Problems

Related Topics: More Trigonometry Lessons




 
In these lessons, we will learn how to find the angles and sides using the sine ratio and how to solve word problems using the sine ratio.

Hints on solving trigonometry problems:

  • If no diagram is given, draw one yourself.
  • Mark the right angles in the diagram.
  • Show the sizes of the other angles and the lengths of any lines that are known
  • Mark the angles or sides you have to calculate.
  • Consider whether you need to create right triangles by drawing extra lines. For example, divide an isosceles triangle into two congruent right triangles.
  • Decide whether you will need Pythagoras theorem, sine, cosine or tangent.
  • Check that your answer is reasonable. The hypotenuse is the longest side in a right triangle.

Example:
sine ratio examples

Calculate the length of the side x, given that sin θ = 0.6

Solution:

Using Pythagoras’ theorem:

Find Missing Sides

Find the missing length of a triangle using the sine function
These two videos show you how to find the missing length of a triangle using the sine function.
We are given a right triangle and two side lengths and a missing length.
We show a right triangle and label the hypotenuse, and two legs the opposite side and adjacent side according to their relation to θ.



Trigonometry Basics : SOHCAHTOA
How to find missing sides using sine, cosine and tangent?

Find Missing Angles

Trigonometry : using SOHCAHTOA to find missing angles.
Trig Ratios - SOH - CAH - TOA
Find missing Angle - Using Inverse Sine, Cosine

Sine Function Word Problems

A word problem involving the trigonometric ratio of sine to calculate the height of a pole
Example:
A 55ft wire connects a point on the ground to the top of a pole. The cable makes an angle of 60 degrees to the ground. Find the height of the pole to the nearest foot.

Rotate to landscape screen format on a mobile phone or small tablet to use the Mathway widget, a free math problem solver that answers your questions with step-by-step explanations.


You can use the free Mathway calculator and problem solver below to practice Algebra or other math topics. Try the given examples, or type in your own problem and check your answer with the step-by-step explanations.


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