Missing Angle Using Trigonometric Identities

Solve for the missing angle

• 32°
• 44°
• 61°
• 50°

To solve for the missing angle, what trig equation do we set up?

You are standing at A, looking up at the airplane. It is 400 m horizontally in front of you and 300 m high.  What is the angle of elevation to the airplane as shown in the diagram? 

Which inverse trig function would you use to find the measure of Angle A?

• inverse sine

• inverse cosine

• inverse tangent

• It is not possible to determine m<A

Which expression is correct for "y"?

• y = tan^–1(31/23)

• y = sin^–1(31/23)

• y = cos^–1(31/23)

How would you find the value of the angle denoted by "?"

• Apply the inverse sine

• Apply the inverse cosine

• Apply the inverse tangent

• Apply the Pythagorean Theorem

What is the most efficient way to find "x"?

• Inverse sine

• Inverse cosine

• Inverse tangent

• Pythagorean Theorem

Find the measure of the indicated angle (?) round to the nearest tenth.

• 9.4
• 55.2
• 20.15
• 19.4

Find the measure of the indicated angle (?) round to the nearest tenth.

• 33°
• 49°
• 39°
• 41°

Find the size of the angle labelled x (to 1dp)

• 60.0°

• 30.0°

• 26.6°

• 63.4°