2013
Mathematics
JAMB
In the diagram given, find the value of x.
A.
30°
B.
40°
C.
45°
D.
15°
Correct Answer: 40°
Explanation
In the diagram above, < CDE = < CED = 15° (base < s of isos. △) < ECD = 180° - (15 + 15)° = 180° - 30° = 150° But x + 110° = 150° (Sum of opp. interior < s of a△ = opp. exterior < ) x = 150° - 110° = 40°
In the diagram above, < CDE = < CED = 15° (base < s of isos. △) < ECD = 180° - (15 + 15)° = 180° - 30° = 150° But x + 110° = 150° (Sum of opp. interior < s of a△ = opp. exterior < ) x = 150° - 110° = 40°THIS WEEK's
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