Henry Park Pri Sch 2007 PSLE Math Prelim Q39

The figure is not drawn to scale. ABCD is a parallelogram. Find Angle ADC.



Solution

Angle AEB = (180 - 58 – 35) degrees = 87 degrees
(Angles in a triangle)

Angle ABC = (87 + 38) degrees = 125 degrees

Angle ADC = 125 degrees (Answer) (Opposite angles of a parallelogram)