Mathematics
JAMB 2002
In the diagram above, PST is a straight line, PQ = QS = RS. If ∠RST = 72
o, find x
-
A.
36o
-
B.
18o
-
C.
72o
-
D.
24o
Correct Answer: Option D
Explanation
In Δ PQS, ∠PSQ = X(base ∠s of isoc Δ PQS)
In Δ QRS, ∠RQS = ∠PSQ + X(Extr ∠ = sum of two intr. opp ∠s)
∴ ∠RQS = X + X
= 2X
Also ∠QRS = 2X(base ∠s of isoc Δ QRS in Δ PRS,
72 = ∠RPS + ∠PRS(Extr, ∠ = sum of two intr. opp ∠s)
∴ 72 = x + 2x
72 = 3x
x =
72/
3
x = 24
o
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