Basic Trig Ratios

Front

What is the definition of a right triangle?

Back

A right triangle is a triangle that has one angle measuring 90 degrees.

Front

What are the three sides of a right triangle called?

Back

The three sides are called the opposite side, adjacent side, and hypotenuse.

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 formula for the sine ratio?

Back

Sine (sin) = Opposite / Hypotenuse.

Front

What is the formula for the cosine ratio?

Back

Cosine (cos) = Adjacent / Hypotenuse.

Front

What is the formula for the tangent ratio?

Back

Tangent (tan) = Opposite / Adjacent.

Front

If the opposite side is 3 and the hypotenuse is 5, what is the sine ratio?

Back

Sine = 3/5.

Front

If the adjacent side is 4 and the hypotenuse is 5, what is the cosine ratio?

Back

Cosine = 4/5.

Front

If the opposite side is 3 and the adjacent side is 4, what is the tangent ratio?

Back

Tangent = 3/4.

Front

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

Back

Tangent can be expressed as the ratio of sine to cosine: tan = sin/cos.