Mathematics Form 3: Chapter 5 trigonometric ratios

What is the sine of angle A in a right-angled triangle?

• opposite/adjacent

• adjacent/hypotenuse

• opposite/hypotenuse

• hypotenuse/opposite

Which of the following is the correct trigonometric ratio for tangent (tan)?

• Opposite / Hypotenuse
  

• Adjacent / Hypotenuse

• Opposite / Adjacent

• Hypotenuse / Adjacent

In a right triangle, if angle B = 30° and the hypotenuse is 10 cm, what is the length of the side opposite to angle B?

• 10 cm

• 5 cm

• 8.7 cm

• 7 cm

What is cos(60°)?

• 0.5

• 0.866

• 1

• √3

Which function would you use to find the length of the adjacent side in a right triangle when given the hypotenuse and angle?

• cos

• tan

• sin

If tan A = 0.75 and the adjacent side is 8 cm, what is the length of the opposite side?

• 6 cm

• 10.67 cm

• 8.75 cm

• 12 cm

Which angle gives a cosine value of 0?

• 0°

• 
  45°
  

• 
  90°
  

• 180°

What is the correct expression to find angle θ in a right triangle with opposite = 7 cm and hypotenuse = 10 cm?

• θ = cos⁻¹(7/10)
  

• 
  θ = tan⁻¹(7/10)
  

• θ = sin⁻¹(7/10)

• θ = sin(7/10)

What is the value of sin(90°)?

• 1

• 0

• 0.5

• 2

Which of the following is NOT a trigonometric ratio?

• sine

• cosine

• tangent

• secant