Introduction to Trigonometry

What is the sine of a 30-degree angle?

• 0.75

• 0.5

• 1.0

• 0.25

What is the cosine of a 60-degree angle?

• 1.0

• 0.866

• 0.5

• 0.25

Identify the hypotenuse in a right triangle with legs of 3 and 4.

• 5

• 8

• 7

• 6

In a right triangle, if one angle is 90 degrees and another is 30 degrees, what is the third angle?

• 75 degrees

• 45 degrees

• 60 degrees

• 90 degrees

Using the Pythagorean theorem, find the length of the hypotenuse if the legs are 5 and 12.

• 10

• 15

• 13

• 17

What is the sine ratio in a right triangle?

• Sine ratio = adjacent side / hypotenuse

• Sine ratio = opposite side / adjacent side

• Sine ratio = hypotenuse / adjacent side

• Sine ratio = opposite side / hypotenuse

If the opposite side is 7 and the hypotenuse is 25, what is the sine of the angle?

• 0.28

• 0.75

• 0.56

• 0.14

Calculate the cosine of a 45-degree angle.

• 0.7071

• 1.0

• 0.5

• 0.8660

In a right triangle, if the adjacent side is 8 and the hypotenuse is 10, what is the cosine of the angle?

• 0.6

• 1.0

• 0.5

• 0.8

What is the tangent of a 45-degree angle?

• 1.5

• 1

• 0

• 2