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pls solve all or snd links

Q.7. (a) In figure (1) given below, equilateral triangle EBC surmounts square ABCD. Find angle BED represented by x.

(b) In figure (2) given below, ABCD is a rectangle and diagonals intersect at O. AC is produced to E. If $\angle $ ECD = 146$\xb0$, find the angles of the $\u25b3$AOB.

(c) In figure (3) given below, ABCD is a rhombus and diagonals intersect at O. If $\angle $OAB : $\angle $OBA = 3 : 2, find the angles of the $\u25b3$AOD.