Q7. (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°, find the angles of the $\u2206$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 $\u2206$AOD.

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