Question

the joining figure ad is perpendicular bisector of BC seed three pairs of equal parts in triangle abc and triangle oecd is a b is equal to angle ACD give reason is a b c and Aircel right angle give reason

Answer 1

hello dear,
1)In triangle ABD & ACD,
  angle A is common 
   BD = CD as AD is perpendicular to BC
  AD is common 

2)both triangles are congruent because of the answer stated in sub question 1
thus, ABD is congruent to ACD by SAS criteria

3)as ABD is congruent to ACD by SAS criteria ,
  thus, ABC is an isoceles triangle by CPST

hope i helped you my friend 
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