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The bisector of angle A in parallelogram ABCD meets DC at point E.
Given angle A = 100°, the bisector makes angle DAE = 50° with AD.
Since AB is parallel to DC, angle AED equals angle DAE (alternate angles).
What is the measure of angle AED (in degrees)?

Class 8Properties of ParallelogramsQuadrilaterals
  • A55
  • B100
  • C45
  • D50

Step-by-Step Solution

Angle DAE = deg. Since AB || DC, angle AED = angle BAE = 50 deg (alternate interior angles), which also makes triangle ADE isosceles with AD = DE.
Answer: D) 50

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