LT 9.3 Trig Find Sides (SIN and COS)

Front

What is the definition of the sine function (SIN)?

Back

The sine function (SIN) is defined as the ratio of the length of the opposite side to the length of the hypotenuse in a right triangle.

Front

What is the definition of the cosine function (COS)?

Back

The cosine function (COS) is defined as the ratio of the length of the adjacent side to the length of the hypotenuse in a right triangle.

Front

What is the formula to find the sine of an angle in a right triangle?

Back

SIN(X) = Opposite / Hypotenuse.

Front

What is the formula to find the cosine of an angle in a right triangle?

Back

COS(X) = Adjacent / Hypotenuse.

Front

How do you solve for an unknown side using the sine function?

Back

To solve for an unknown side using the sine function, rearrange the formula: Opposite = Hypotenuse * SIN(X).

Front

How do you solve for an unknown side using the cosine function?

Back

To solve for an unknown side using the cosine function, rearrange the formula: Adjacent = Hypotenuse * COS(X).

Front

What is the relationship between the angles and sides in a right triangle?

Back

In a right triangle, the angles determine the ratios of the sides, which are consistent for all right triangles.

Front

What is the value of SIN(30 degrees)?

Back

SIN(30 degrees) = 0.5.

Front

What is the value of COS(60 degrees)?

Back

COS(60 degrees) = 0.5.

Front

How do you round a number to the nearest tenth?

Back

To round a number to the nearest tenth, look at the hundredths place; if it's 5 or more, round up.