Finding Missing Angles and Using Ratios in Triangles

Find the measure of the missing angle.

• 90^o

• 10⁰

• 130^o

• 50^o

Solve for x.

• 16

• 11

• 50

• 6

If two of the angles of a triangle are 30 and 70 degrees, the third angle measures...

• 80

• 100

• 60

• 90

What is the third angle of a triangle whose 1st angle is 34 and 2nd angle is 101?

• 32

• 39

• 45

• 54

What do the angles in an equilateral triangle measure?

• 30, 60, 90

• 45, 45, 90

• 60, 60, 60

• 35, 55, 90

Find the missing angle.  Find x.

• 20^o

• 70^o

• 160^o

• 180^o

Choose the correct technique to find the missing angle (theta = θ)

• Pythagoras Theorem

• Trigonometry Ratio

• Sine Rule

• Cosine Rule

Based on the math work in the picture, what problem has been solved?

• Finding a side using sine rule

• Finding an angle using sine rule

• Finding a side using cosine rule

• Finding an angle using cosine rule

What is the cosine rule used for in non-right triangles?

• To calculate the area of non-right triangles.

• The cosine rule is used to find unknown sides or angles in non-right triangles.

• To determine the perimeter of any triangle.

• To find the height of a triangle.

Choose the correct technique to find the missing side of this triangle

• Pythagoras Theorem

• Trigonometry Ratio

• Sine Rule

• Cosine Rule