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WAEC WASSCE Mathematics 2020 past questions and answers

This 2020 WAEC WASSCE Mathematics set has 40 practice questions. Try these 5 free sample questions, tap a question to reveal the answer and explanation. Then practise the whole 2020 set with instant marking.

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Sample WAEC WASSCE Mathematics 2020 questions

1. Three angles around a point are 85 degrees, 120 degrees and 65 degrees. What is the fourth angle?
  1. 90 degrees
  2. 85 degrees
  3. 95 degrees
  4. 100 degrees

Answer: A. 90 degrees

Angles around a point sum to 360 degrees, so the fourth angle is 360 - 85 - 120 - 65 = 90 degrees.

2. What are the coordinates of the image of P(-3, 4) after reflection in the y-axis?
  1. (-3, -4)
  2. (4, -3)
  3. (3, 4)
  4. (3, -4)

Answer: C. (3, 4)

Reflection in the y-axis changes the sign of the x-coordinate but leaves the y-coordinate unchanged.

3. If a = (2, -1) and b = (-3, 4), what is the vector 2a + b?
  1. (7, -6)
  2. (1, 2)
  3. (-1, 2)
  4. (1, -6)

Answer: B. (1, 2)

Since 2a = (4, -2), adding b gives (4 - 3, -2 + 4) = (1, 2).

4. Find the area of a circle of radius 7 cm, using pi = 22/7.
  1. 44 cm^2
  2. 77 cm^2
  3. 144 cm^2
  4. 154 cm^2

Answer: D. 154 cm^2

The area is pi r^2 = (22/7) x 7 x 7 = 154 cm^2.

5. For an acute angle theta, sin(theta) = 3/5. What is cos(theta)?
  1. 4/5
  2. 3/4
  3. 5/4
  4. 5/3

Answer: A. 4/5

The 3-4-5 right triangle gives the adjacent side ratio as cos(theta) = 4/5.

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