Trigonometric Ratios

sin(A)

• opposite over hypotenuse

• 3 over 5

For 30° 60° 90° triangles, the side opposite the 30° angle is (a)   the hypotenuse

Sine of 72°

• GO/DG

• 8.2/DG

• DG/GO

cosine 20°

• a/b

• b/c

• a/c

tan 20°

• a/b

• a/c

• b/c

cosine 70°

• a/b

• b/c

• a/c

cos(A)

(a)  

sin(E)

• opposite over hypotenuse

• 4/DE

• DF/4

Two triangles are (a)   if they have the same size and shape.

(a)   triangles are triangles with the same shape, but not necessarily the same size.