CAIE IGCSE Mathematics Extended E6.2.1 Know and Use the Sine Cosine and Tangent Ratios for Acute Angles in Questions

Practise Extended CAIE IGCSE Mathematics by choosing and applying trigonometric ratios in acute-angle right triangles.

Exam points

Use sine, cosine and tangent ratios to find missing sides in right-angled triangles.
Choose the appropriate trigonometric ratio from the given sides and angle.
Use inverse trigonometric reasoning or rearrangement to solve acute-angle problems.

[Maximum number: 3]

Calculate the acute angle KML.

76.5 or 76.52 to 76.53
M2 for $\sin M=\frac{16.7\sin32}{9.1}$ oe
or M1 for $\frac{9.1}{\sin32}=\frac{16.7}{\sin M}$ oe

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