2017
Mathematics
JAMB
From the diagram above, find the value of x
A.
15°
B.
45°
C.
25°
D.
30°
Correct Answer: 15°
Explanation
∠BDC + ∠BDA = 180° { Sum ∠s on a straight line } 65° + ∠BDA = 180° ∠BDA = 115° ∠BDA + ∠BAD + ∠ABD = 180° (Sum ∠s in a △ } 115° + 50° + x = 180°. x = 15°
∠BDC + ∠BDA = 180° { Sum ∠s on a straight line } 65° + ∠BDA = 180° ∠BDA = 115° ∠BDA + ∠BAD + ∠ABD = 180° (Sum ∠s in a △ } 115° + 50° + x = 180°. x = 15°THIS WEEK's
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