IGCSE Mathematics - 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:

In IGCSE Mathematics:

SOH stands for sine=opposite/hypotenuse

CAH stands for cosine=adjacent/hypotenuse

TOA stands for tangent=opposite/adjacent

• Label Sides

  1. Side opposite to unknown angle should be labeled as opposite

  2. The side next to unidentified angle should be labeled as adjacent

  3. 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!

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Drafted by Gina (Mathematics)