Sin, Cos, Tan

Front

What is the definition of sine (sin) in a right triangle?

Back

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

Front

What is the definition of cosine (cos) in a right triangle?

Back

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

Front

What is the definition of tangent (tan) in a right triangle?

Back

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

Front

If sin θ = opposite/hypotenuse, what is the formula to find the opposite side?

Back

Opposite = sin θ × hypotenuse.

Front

If cos θ = adjacent/hypotenuse, what is the formula to find the adjacent side?

Back

Adjacent = cos θ × hypotenuse.

Front

If tan θ = opposite/adjacent, what is the formula to find the opposite side?

Back

Opposite = tan θ × adjacent.

Front

What is the relationship between sin, cos, and tan?

Back

tan θ = sin θ / cos θ.

Front

In a right triangle, if you know two sides, which trigonometric function do you use to find the angle?

Back

Use the inverse trigonometric functions: sin⁻¹, cos⁻¹, or tan⁻¹.

Front

What is the sine of 30 degrees?

Back

sin 30° = 1/2.

Front

What is the cosine of 60 degrees?

Back

cos 60° = 1/2.