Discovering Trigonometry

Match the trigonometric ratios

• A/H

• Cos

• O/H

• Sin

• O/A

• Tan

In relation to the defined angle, label the opposite (O), Hypotenuse (H) and Adjacent (A) Angles

a

b

c

Opposite

Adjacent

Hypotenuse

Find the sin ratio for this triangle.

Mathematical Equivalence

ON

Find the cos ratio for this triangle.

Mathematical Equivalence

ON

Find the tan ratio for this triangle.

Mathematical Equivalence

ON

Which is the only trigonometric ratio that can equal more than 1?

• sine

• cosine

• tangent

• -1
• 1

• -1
• 1

Which is equivalent to cos(70)

• sin(70)

• sin(140)

• sin(20)

• sin(160)