## Trigonometry Terms I

### Complementary Angles: Learn

A right triangle consists of one angle of 90oand two acute angles. Each acute angle of a right triangle has the properties of sine, cosine and tangent.

The sine, cosine and tangent of an acute angle of a right triangle are ratios of two of the three sides of the right triangle.

The ** sine** of the angle is the ratio of the length of the side

**opposite**the angle divided by the length of the

**hypotenuse**.

The ** cosine** of the angle is the ratio of the length of the side

**adjacent**to the angle divided by the length of the

**hypotenuse**.

The ** tangent** of the angle is the ratio of the length of the side

**opposite**the angle divided by the length of side

**adjacent**to the angle.

Trigonometry is like a story told from the perspective of one angle in a right triangle. The diagram below labels the sides of a right triangle from the perspective of the angle labeled "A". If we switched the story to the perspective of the other acute angle, the adjacent/opposite sides would also switch.

### Trig Terms: Practice

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