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28 tháng 12 2017

Giup minh nha 

28 tháng 12 2017

a. AB= OA + OB = 2 + 5 = 7 cm

19 tháng 11 2017

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19 tháng 11 2017

uytyyyy

23 tháng 10 2014

vì 4 điểm CABD thẳng hàng ta có

BD=AC

CB=AB+AC  

AD=AB+BD 

=> CB=AD

23 tháng 4 2016

ta co CB=CA+AB

         AD=AB+BD

ma CA=BD, AB la canh chung nen CB=AD