GCSE Secondary Maths Age 13-17 - Pythagoras & Trigonometry: Trigonometry - Sin, Cos, Tan - Explained

The video tutorial explains how to solve a geometry problem involving a right angle triangle. It covers finding the angle ABC using trigonometry, specifically the cosine function. The process includes labeling the triangle, using the cosine formula, and calculating the angle with a calculator. The tutorial also discusses the effect of reducing the length of side AB on the cosine of angle ABC, emphasizing the importance of understanding the question requirements.

What is the length of side BC in the triangle?

How do you determine which trigonometric ratio to use for finding angle A to B to C?

What is the formula for cosine in relation to the sides of a triangle?

What values do you substitute into the cosine formula to find angle X?

What is the final answer for angle X after rounding to one decimal place?

Explain why it is important to check the calculator mode before solving trigonometric problems.

If the length of side AB is reduced by 1 centimeter, how does this affect the cosine of angle ABC?