ABCD is a rectangle whose three vertices are (4,3) ,(4,1) and (0,1). Find the length of its
diagonal.
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Answer:
a right angle triangle will be formed with the diagonal as the hypotenuese of the triangle.
the two sides will be 2 and 4 therefore by Pythagoras theorem 2² + 4² = diagonal²
diagonal = √20 = 2√5
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