in figure  triangle isosceles with BC=AC if  triangle A= 70 find (1) tri angle abc (2) triangle CBD ( give reasons to support your answer )

he is correct

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the first one is correct 

we can't draw diagrams here, but I can tell answers and reasons,

triangle abc, has three angles. angle A equals 70, angle B equals 55 and Angle C equals 55. Because you say it is Isosceles triangle, the two sides and two angles must be equal from properties of Isosceles triangle.

i.e triangle equals 180=70+B+C

180-70=B+C

110=B+C

therefore B=C=55 (since both are equal, the 110 angle is divided by 2.)

hope you must have understood, if yes, please give thumbs up.

triangle abc, has three angles. angle A equals 70, angle B equals 55 and Angle C equals 55. Because you say it is Isosceles triangle, the two sides and two angles must be equal from properties of Isosceles triangle.
i.e triangle equals 180=70+B+C
180-70=B+C
110=B+C
therefore B=C=55 (since both are equal, the 110 angle is divided by 2.)
 

sorry we can't draw diagrams here, but I can tell answers and reasons,

triangle abc, has three angles. angle A equals 70, angle B equals 55 and Angle C equals 55. Because you say it is Isosceles triangle, the two sides and two angles must be equal from properties of Isosceles triangle.
i.e triangle equals 180=70+B+C
180-70=B+C
110=B+C
therefore B=C=55 (since both are equal, the 110 angle is divided by 2.)