Trigonometry SOHCAHTOA Flashcards

GCSE Mathematics (Edexcel) 1MA1

SOHCAHTOA

A mnemonic to remember the trigonometric ratios: Sine = Opposite / Hypotenuse, Cosine = Adjacent / Hypotenuse, Tangent = Opposite / Adjacent.

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Terms in this set (10)

1

SOHCAHTOA

A mnemonic to remember the trigonometric ratios: Sine = Opposite / Hypotenuse, Cosine = Adjacent / Hypotenuse, Tangent = Opposite / Adjacent.

2

Sine (sin) ratio

Sine of an angle = Opposite side / Hypotenuse.

3

Cosine (cos) ratio

Cosine of an angle = Adjacent side / Hypotenuse.

4

Tangent (tan) ratio

Tangent of an angle = Opposite side / Adjacent side.

5

Hypotenuse

The longest side of a right-angled triangle, opposite the right angle.

6

Opposite side

The side opposite the angle being considered in a right-angled triangle.

7

Adjacent side

The side next to the angle being considered in a right-angled triangle, excluding the hypotenuse.

8

Finding an angle using sine

Use sin⁻¹ (inverse sine) on a calculator: angle = sin⁻¹(Opposite / Hypotenuse).

9

Finding an angle using cosine

Use cos⁻¹ (inverse cosine) on a calculator: angle = cos⁻¹(Adjacent / Hypotenuse).

10

Finding an angle using tangent

Use tan⁻¹ (inverse tangent) on a calculator: angle = tan⁻¹(Opposite / Adjacent).

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