YouTube on MSNOpinion

Evaluate the half angle of tangent using a triangle

Description: 👉 Learn how to evaluate the tangent of a half-angle. When given the value of the tangent of an angle, we can ...
YouTube on MSNOpinion

Tangent difference of two angles identities using triangles

Learn how to evaluate the secant of the sum or difference of two angles using the sum/difference formulas. To do this, we ...
BBC

Introduction to trigonometry for right-angled triangles

The sides of right-angled triangles are labelled opposite, hypotenuse and adjacent. Trigonometry explores the relationship between sides and angles in right-angled triangles. The hypotenuse is the ...
BBC

Higher – Calculations using the alternate segment theorem, tangents and chords

It is important to remember other angles rules, such as angles on a straight line add up to 180°, and to recognise angles in parallel lines. Make sure you are confident in applying Pythagoras’ theorem ...