Sine and Cosine Rule - which one?

For a Non-Right Angled Triangle, if we are given the measures of two angles and the length of a side (AAS) and are required to find the length of another side, we use

• Pythagoras' Theorem

• Trig Ratios

• Inverse Trigonometric Function

• Sine Rule

• Cosine Rule

For a Non-Right Angled Triangle, if we are given the lengths of two sides and the size of the included angle (SAS) and are required to find the length of another side, we use

• Pythagoras' Theorem

• Trig Ratios

• Inverse Trigonometric Function

• Sine Rule

• Cosine Rule

For a Non-Right Angled Triangle, if we are given the lengths of two sides and the size of an angle (SSA) and are required to find the size of another angle, we use

• Pythagoras' Theorem

• Trig Ratios

• Inverse Trigonometric Function

• Sine Rule

• Cosine Rule

For a Non-Right Angled Triangle, if we are given the lengths of all three sides (SSS) and are required to find the size of an angle, we use

• Pythagoras' Theorem

• Trig Ratios

• Inverse Trigonometric Function

• Sine Rule

• Cosine Rule

What rule should you use to find the size of angle B?

• Sine

• Cosine

What rule should you use to find the length of AC?

• Sine

• Cosine

What rule should you use to find the size of angle B?

• Sine

• Cosine

What rule should you use to find the length of c?

• Sine

• Cosine

Choose the appropriate method to solve for x

• Pythagoras' Theorem

• Trig Ratios

• Inverse Functions

• Sine Rule

• Cosine Rule

Choose the appropriate method to solve for x

• Pythagoras' Theorem

• Trig Ratios

• Inverse Functions

• Sine Rule

• Cosine Rule