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Angles

In IGCSE Mathematics, you should know that:

- Sum of the interior angles:
**180(n-2)** - The exterior angles in a polygon add up to
**360 degrees**

Corresponding angles

Alternate angles

Interior angles

Trigonometry for Right-angled Triangles:

SOH CAH TOA

In IGCSE Mathematics:

SOH stands for **sine=opposite/hypotenuse**

CAH stands for **cosine=adjacent/hypotenuse**

TOA stands for **tangent=opposite/adjacent**

Label Sides

Side opposite to

**unknown**angle should be labeled as oppositeThe side next to

**unidentified**angle should be labeled as adjacent**Longest**side of triangle should be labeled as hypotenuse

Sine, cosine, tangent - **Side lengths** of a triangle

Sine-1, cosine-1, tangent-1 - **Angles** of a triangle

End of this topic!

Drafted by Gina (Mathematics)