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2015-11-25T21:20:51+05:30

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The angle of rectangle is 90°. Consider the diagonally half rectangle as a right angled triangle. By theorem of Pythagaras, (Diagonal)^2=(30)^2+(40)^2=900+1600=2500. Hence diagonal=50cm.
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2015-11-25T21:28:16+05:30

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Certified answers contain reliable, trustworthy information vouched for by a hand-picked team of experts. Brainly has millions of high quality answers, all of them carefully moderated by our most trusted community members, but certified answers are the finest of the finest.
By Pythagoras theorem ;
AC²=AB²+BC²
AC²= 30²+40²
AC²=900+1600
AC²=2500CM
AC=√2500 CM
AC=50

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