Basic Trig Ratios

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

sinA = opposite/hypotenuse

Front

What is the cosine ratio?

Back

cosA = adjacent/hypotenuse

Front

What is the tangent ratio?

Back

tanA = opposite/adjacent

Front

How can you remember the trigonometric ratios?

Back

Use the mnemonic 'Soh Cah Toa'.

Front

If sin(30) = x/10, what is x?

Back

x = 10 * sin(30) = 5.

Front

If cos(45) = x/14, what is x?

Back

x = 14 * cos(45) = 14 * (√2/2) = 7√2.

Front

If tan(60) = x/12, what is x?

Back

x = 12 * tan(60) = 12 * √3.

Front

What is the relationship between sine and cosine?

Back

sinA = cos(90° - A).

Front

What is the value of sin(90°)?

Back

sin(90°) = 1.