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A, B, C and D are four points on a circl...

A, B, C and D are four points on a circle. AC and BD intersect at a point E such that `/_B E C\ =130^(@)` and `/_E C D=20^(@)` Find `/_B A C^(@)`

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Please refer to video for the figure.
Here, `/_BEC = 130^@ and /_ECD = 20^@` `/_AEB+/_BEC = 180^@`(Sum of angles formed by a straight line is 180^@)
`/_AEB = 180-130 =50^@`
Also, `/_ABD = /_ACD` as these angles are subtended by a same chord on the circle.
So,` /_ABD = /_ABE = 20^@`
Now, in `Delta AEB`
`/_ABE+/_AEB+/_EAB = 180^@`
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