The triangle PQR above is

Mathematics JAMB 2002

The triangle PQR above is

  • an obtuse-angled triangle
  • a scalene triangle
  • an isosceles triangle checkmark
  • an equilateral triangle

The correct answer is: C

Explanation

∠PQR = 180 - 128 (∠s on a straight line)
= 52o
∠QPR + 76 + 52 = 180(extr ∠ = sum of intr. opp ∠s)
∠QPR + 128 = 180
∠QPR = 180 - 128
= 52o
∴ΔPQR is an isosceles triangle
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