and
are the centers of the orange square and the green square.
is the midpoint of
.
. Calculate
This is part of the series: " It's easy, believe me! "
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Distance A B = 2 a + 2 b = 2 ( a + b ) .
Distance M N = m = average of a and b = 2 a + b
Therefore M N A B = 2 a + b 2 ( a + b ) = 4