ABCD is a quadrilateral in which AD = BC and ?DAB = ?CBA. Prove that ?ABD ? ?BAC.

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Area=16×8=128sq.cm
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Consider ?ABD,?BAC AB=AB(common side) AD=BC(given) angleDAB=angleBAC By SAS axiom ?ABD congruent to ?BAC By congruency corresponding angles are equal angleABD=angleBAC
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is zero a rational number, can you write it in the form of p/q , where p and q are integeres and q !=0

Yes, of course 0 is a rational number. All natural numbers whole numbers and integers are also rational numbers. 0 can be written as 0/1 , 0/2 etc Hence it is natural number
Murali
The mean of 10, 15, x, 5, 15 is 15. What is the value of x?
(10+15+x+5+15)/5=15 So 45 + x = 5*15 X=75-45=30
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