Answers

2015-12-25T11:43:57+05:30
We know that ab = cd ⇒equation 1  (all sides of a rohmbus are equal)
by ysing pythogaras theorem as angles aob = doc =90°

ab=oa²+ob², cd=oc²+cd²
by substituting these values in equation 1
                 oa²+ob²=oc²+cd²
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