2013
Mathematics
JAMB
If the angles of a quadrilateral are (3y + 10)°, (2y + 30)°, (y + 20)° and 4y°. Find the value of y.
A.
66°
B.
12°
C.
30°
D.
42°
Correct Answer: 30°
Explanation
Sum of angles in a quadrilateral = 360° ∴ (3y + 10) + (2y + 30) + (y + 20) + 4y = 360 10y + 60 = 360 ⟹ 10y = 300 y = 30°
Sum of angles in a quadrilateral = 360° ∴ (3y + 10) + (2y + 30) + (y + 20) + 4y = 360 10y + 60 = 360 ⟹ 10y = 300 y = 30°THIS WEEK's
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