2012 · Q73
In the figure, AB is parallel to CD. angle ABC = 65 degrees, angle CDE = 15 degrees and AB = AE. What is angle AEF equal to? (F is on the extension of DE beyond E.)
Elementary MathematicsGeometry
- A30 degrees
- B35 degrees
- C40 degrees
- D45 degrees
Explanation
AB parallel CD gives angle DCE = 65 degrees, so angle CED = 100 degrees; with angle AEB = 65 degrees (isosceles AB = AE), angle AEF = 35 degrees.