Trigonometry Basics

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

What is the Sine Ratio?

Back

The Sine Ratio is the ratio of the length of the opposite side to the length of the hypotenuse in a right triangle.

Front

What is the Cosine Ratio?

Back

The Cosine Ratio is the ratio of the length of the adjacent side to the length of the hypotenuse in a right triangle.

Front

What is the Tangent Ratio?

Back

The Tangent Ratio is the ratio of the length of the opposite side to the length of the adjacent side in a right triangle.

Front

Identify the opposite side in a right triangle with angle theta.

Back

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

Front

Identify the adjacent side in a right triangle with angle theta.

Back

The adjacent side is the side that is next to angle theta and is not the hypotenuse.

Front

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

Back

In a right triangle, the square of the hypotenuse is equal to the sum of the squares of the other two sides (Pythagorean theorem).

Front

How do you find the length of the hypotenuse?

Back

Use the Pythagorean theorem: c = √(a² + b²), where c is the hypotenuse and a and b are the other two sides.

Front

What is the formula for the Sine function?

Back

Sine(θ) = Opposite / Hypotenuse.

Front

What is the formula for the Cosine function?

Back

Cosine(θ) = Adjacent / Hypotenuse.