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How to explain the red line of the third question of the second college entrance examination of mathematics (liberal arts) in Maoming City, Guangdong Province on 20 12?
Because the height of the triangle AMD with AD as the base is equal to AB.
(Because ABCD is rectangular, AB is perpendicular to AD. If the height L of the triangle AMD is based on AD, L should be perpendicular to AD, ABCD is a rectangle, BC//AD, then L should be parallel and equal to AB. )