A triangle is constructed with two sides 9 cm and 12 cm and an included angle of 90^circ. When measured, the third side should be:

  1. 21 cm
  2. 3 cm
  3. 15 cm
  4. 16 cm
Answer

C) 15 cm

By Pythagoras the third side is 9^2 + 12^2 = 15 cm — a useful check on the accuracy of the construction. SLO M-09-B-28 · Knowledge

Mathematics MCQ · More Construction of Triangles MCQs · Practise