Evaluating Trigonometric Functions at Special Angles

What two shapes are used to evaluate trigonometric functions at special angles?

• Equilateral triangle and scalene triangle

• Scalene triangle and right triangle

• Isosceles right triangle and scalene triangle

• Equilateral triangle and isosceles right triangle

In an equilateral triangle, what is the measure of each angle?

• 45 degrees

• 60 degrees

• 90 degrees

• 30 degrees

What is the sine of 30 degrees in an equilateral triangle?

• 1/2

• 1

• √3

• √3/2

What is the cosine of 60 degrees in an equilateral triangle?

• √3/2

• √3

• 1/2

• 1

How is the tangent of 30 degrees calculated in an equilateral triangle?

• Opposite over adjacent

• Adjacent over hypotenuse

• Opposite over hypotenuse

• Hypotenuse over opposite

What is the tangent of 60 degrees in an equilateral triangle?

• √3/2

• 1

• √3

• 1/2

In an isosceles right triangle, what is the measure of each of the two equal angles?

• 60 degrees

• 45 degrees

• 90 degrees

• 30 degrees

What is the sine of 45 degrees in an isosceles right triangle?

• 1

• 1/2

• √2/2

• √3/2

What is the cosine of 45 degrees in an isosceles right triangle?

• 1/2

• 1

• √3/2

• √2/2

What is the tangent of 45 degrees in an isosceles right triangle?

• 1

• 1/2

• √2

• √3