Trigonometry
Use trigonometric ratios to find unknown sides and angles in right-angled triangles, including angles of elevation and depression.
Measurement and Space · MA5-TRG-C-01
Sub-topics
Sin, cos and tan ratios
Identify the opposite, adjacent and hypotenuse sides of a right-angled triangle relative to a given angle, and use the sin, cos and tan ratios.
Finding unknown sides
Use SOHCAHTOA to find an unknown side in a right-angled triangle given one angle and one side.
Finding unknown angles
Use inverse trigonometric ratios (sin⁻¹, cos⁻¹, tan⁻¹) to find unknown angles in right-angled triangles.
Angles of elevation and depression
Identify angles of elevation and depression, draw and label right-angled triangles from real-world scenarios, and use trigonometric ratios to find unknown distances and heights.