### PROBLEM SOLVING THE LAW OF SINES AND THE LAW OF COSINES PAGE 97

Finding trigonometric ratios for acute or obtuse angles Sine Law Using the law of Sines Ambiguous case of the Law of Sines Part 1 and Part 2 When you are given an acute angle measure and when the side opposite the angle is shorter than the other given side, there are 2 possible triangles. By continuing to use this website, you agree to their use. This site uses cookies. Finding Sides If you need to find the length of a side, you need to use the version of the Sine Rule where the lengths are on the top: Therefore we use trig ratios – sin, cos and tan. Solution to Problem 2: Evaluate the right-hand-side and then square-root to find the length:

Step 1 Start by writing out the Sine Rule formula for finding sides: Start by writing out the Cosine Rule formula for finding angles: When you are ready, write Trigonometry Test. Start by writing out the Sine Rule formula for finding angles: Solve Right Triangles Part 3 4. We appreciate any comments you have about Step-Up Section 4.

You will need to know at least one pair of a side with its opposite angle to use the Sine Rule.

Solutions to Above Exercises 1. Explain the steps in a given proof of the sine law or cosine law. Read and follow the example problems at the beginning of each section. Formulae You Tye Know You should already know each of the following pfoblem You are commenting using your WordPress. If you need to find the size of an angle, you need to use the version of the Cosine Rule where the cos A is on the left: If you need to find the length of a side, you need to know the other two sides and the opposite angle.

Solution to Problem 1: Fill in the values you know, and the unknown angle: Solve a problem involving the cosine law that requires the manipulation of a formula. Step 3 Evaluate the right-hand-side and then square-root to find the length: Sine Rule The Sine Rule can be used in any triangle not just right-angled triangles where a side and its opposite angle are known.

Watch the suggested videos to help you understand the lessons taught.

# Trigonometry | Colleen Knudsgaard’s Website

Work out the answers to the questions below and fill in the boxes. Finding Sides If you need to find the length of a side, you need to know the other two sides and the opposite angle.

You are commenting using your Twitter account. Solve triangle problems using the sine law. Tips on using a calculator for trigonometry.

To the nearest degree, at what angle cosibes a team turn in order to go from the first checkpoint to the second checkpoint? Geometry Tutorials, Problems and Interactive Applets. Therefore we use Pythagoras’s Theorem. Solve problems that involve the cosine law and the sine fhe, including the ambiguous case. Step 1 Start by writing out the Cosine Rule formula for finding sides: If you need to find the size of an angle, you need to use the version of the Sine Rule where the angles are on the top: We consider triangle ABC.

## Sine Law to Solve Triangle Problems

Draw a sknes to represent a problem that involves the cosine law or sine law. To find out more, including how to control cookies, see here: Find the height h of the building round your answer to the nearest unit. Solving Problems involving right triangles Solving problem involving more than one right triangle.

The question involves angles. You are commenting using your Facebook account.

## Section 4: Sine And Cosine Rule

Redo problem 2 with the qnd between points A and B equal to 50 meters. Correct Answers You answered 0 questions correctly out of the questions in this section.

Finding Sides Example Work out the length of x in the diagram below: