Trig Ratios

Front

What is the definition of cosine in a right triangle?

Back

Cosine (cos) of an angle is the ratio of the length of the adjacent side to the length of the hypotenuse.

Front

What is the sine ratio in a right triangle?

Back

Sine (sin) of an angle is the ratio of the length of the opposite side to the length of the hypotenuse.

Front

What is the tangent ratio in a right triangle?

Back

Tangent (tan) of an angle is the ratio of the length of the opposite side to the length of the adjacent side.

Front

How do you find the cosine of an angle using a right triangle?

Back

Identify the length of the adjacent side and the hypotenuse, then use the formula: cos(angle) = adjacent/hypotenuse.

Front

What is the relationship between sine and cosine?

Back

sin^2(angle) + cos^2(angle) = 1, known as the Pythagorean identity.

Front

What is the hypotenuse in a right triangle?

Back

The hypotenuse is the longest side of a right triangle, opposite the right angle.

Front

Identify the opposite side in relation to an angle in a right triangle.

Back

The opposite side is the side that is directly across from the angle.

Front

What is the formula to calculate the tangent of an angle?

Back

tan(angle) = opposite/adjacent.

Front

How do you round a number to the nearest tenth?

Back

Look at the hundredths place; if it's 5 or more, round up the tenths place by one.

Front

What is the cosine of 60 degrees?

Back

cos(60°) = 0.5.