Trig Ratios

Front

What is the sine function in relation to a right triangle?

Back

The sine function (sin) is the ratio of the length of the opposite side to the length of the hypotenuse.

Front

What is the cosine function in relation to a right triangle?

Back

The cosine function (cos) is the ratio of the length of the adjacent side to the length of the hypotenuse.

Front

What is the tangent function in relation to a right triangle?

Back

The tangent function (tan) is the ratio of the length of the opposite side to the length of the adjacent side.

Front

What is the relationship between sine, cosine, and tangent?

Back

tan(A) = sin(A) / cos(A) for any angle A in a right triangle.

Front

What is the definition of an obtuse triangle?

Back

An obtuse triangle is a triangle where one of the angles is greater than 90 degrees.

Front

Can trigonometric functions be used on obtuse triangles?

Back

No, trigonometric functions are defined for right triangles only.

Front

If you know the opposite side and hypotenuse, which trig function do you use?

Back

Use the sine function.

Front

If you know the two sides that are not the hypotenuse, which trig function do you use?

Back

Use the tangent function.

Front

How do you find Cos(A) if you know the adjacent side and hypotenuse?

Back

Cos(A) = adjacent side / hypotenuse.

Front

What is the value of sin(30°)?

Back

sin(30°) = 0.5.