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

Which rule is necessary when there are no right angles in a triangle?

• Quadratic formula

• Pythagorean theorem

• Sine and cosine rules

• Area of a circle

What is the formula for the cosine rule?

• a^2 = b^2 + c^2 - 2bc cos A

• a/sin A = b/sin B = c/sin C

• a^2 + b^2 = c^2

• Area = 1/2 ab sin C

What is the first step in calculating the area of triangle ACD?

• Use the cosine rule

• Use the sine rule

• Find the length of AB

• Calculate the perimeter

Which rule is used to find the length CD in triangle ACD?

• Cosine rule

• Pythagorean theorem

• Sine rule

• Area formula

What is the calculated length of CD?

• 4.9

• 3.8

• 5.65

• 6.2

How is the angle C in triangle ACD calculated?

• Using the area formula

• Using the cosine rule

• Using the sine rule

• Using the tangent rule

What is the final calculated area of triangle ABC?

• 9.16 cm²

• 15.34 cm²

• 19.59 cm²

• 10.42 cm²

What is the final area of triangle BCD after subtraction?

• 9.16 cm²

• 19.59 cm²

• 15.34 cm²

• 10.42 cm²

How many marks are awarded for finding the value of CD?

• 4 marks

• 1 mark

• 2 marks

• 3 marks

What should you be careful about when doing calculations?

• Using a pen

• Using a ruler

• Writing in pencil

• Rounding off too early