GCSE Secondary Maths Age 13-17 - Pythagoras & Trigonometry: Trigonometry - Explained

The video tutorial explains a trigonometry problem involving a rectangle and a right-angled triangle. The problem requires calculating the length of a line segment using trigonometric principles. The teacher guides through the process of identifying known values, applying sine and cosine rules, and ensuring accuracy in calculations. The tutorial emphasizes the importance of not rounding intermediate results to maintain precision. The problem is positioned as a Grade B question with elements of Grade A difficulty, highlighting the application of trigonometry across different triangles to achieve the solution.

What is the shape of the figure described in the problem?

• Circle

• Triangle

• Rectangle

• Square

Which angle is given as 60 degrees in the problem?

• Angle E to A to C

• Angle A to B to C

• Angle C to D to E

• Angle A to C to B

What trigonometric function is used to calculate the length of AC?

• Tangent

• Cosine

• Sine

• Secant

Why is it important not to round off the intermediate answer when calculating AC?

• To simplify the problem

• To save time

• To avoid losing accuracy marks

• To make calculations easier

Which trigonometric function is used to find the length of CE?

• Cosine

• Cotangent

• Tangent

• Sine

What is the final calculated length of CE?

• 13.85 cm

• 16 cm

• 18 cm

• 12 cm

How many marks are awarded for finding the length of AC?

• Two marks

• One mark

• Four marks

• Three marks