HOTS Mathematics Primary 5 Geometry

ABCD is a rhombus where angle DAB = 140 degrees. AE is drawn such that AE bisects angle DAB and E is a point on BC. Find angle AEB.

A 70°
B 40°
C 35°
D 110°
Show Worked Solution

Worked Solution

Step 1: Find angle ABC using the property of a rhombus. In a rhombus, AD is parallel to BC, so angle DAB and angle ABC are co-interior angles. Angle ABC = 180 - 140 = 40 degrees Step 2: Find angle BAE using the angle bisector. AE bisects angle DAB, so angle BAE = 140 / 2 = 70 degrees Step 3: Find angle AEB using the angle sum of triangle ABE. Angle AEB = 180 - angle BAE - angle ABE Angle AEB = 180 - 70 - 40 = 70 degrees Answer: Angle AEB = 70 degrees

Correct answer: 70°

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