2002
Mathematics
JAMB
The triangle PQR above is
A.
an obtuse-angled triangle
B.
a scalene triangle
C.
an isosceles triangle
D.
an equilateral triangle
Correct Answer: an isosceles triangle
Explanation
∠PQR = 180 - 128 (∠s on a straight line) = 52° ∠QPR + 76 + 52 = 180(extr ∠ = sum of intr. opp ∠s) ∠QPR + 128 = 180 ∠QPR = 180 - 128 = 52° ∴ΔPQR is an isosceles triangle
∠PQR = 180 - 128 (∠s on a straight line) = 52° ∠QPR + 76 + 52 = 180(extr ∠ = sum of intr. opp ∠s) ∠QPR + 128 = 180 ∠QPR = 180 - 128 = 52° ∴ΔPQR is an isosceles triangleTHIS WEEK's
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