The figure below shows
a quadrilateral ABCD, AB = AD, angle ABC = angle ADC = 90 degrees. If AN
and DM are perpendicular, prove that AM and BN are perpendicular.*This entry contributed by Erina-NJ*.

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Geometry Problems

Ten problems: 1401-1410

Visual Index

Open Problems

All Problems

Quadrilateral

Perpendicular lines

Congruence

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