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UI Post-UTME Mathematics 2012 Question 4

Question 4

Mensuration of Plane Shapes

In the figure above, BK = KC = 5cm. AK = 3cm. find the area of the triangle.

Diagram for this question
  1. A.30cm2
  2. B.38cm2
  3. C.15cm2
  4. D.25cm2
Show the answer and explanation

Answer: C (15cm2)

Explanation

AK is the height and the base BC = 10 cm, so area = ½ × 10 × 3 = 15 cm².