Question

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Answer 1

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Angle ( a ) + Angle( b ) + 80° = 180°

( interior angles of ∆ )

( i ) Angle a + Angle b = 100° ------------- ( 1 )

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Angle ( c ) + Angle( d ) + 80° = 180°

( interior angles of ∆ )

( ii ) Angle c + Angle d = 100° ------------ ( 2 )

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By adding eqñ ( 1 ) and ( 2 )

a + b + c + d = 100 + 100

a + b + c + d = 200

In a parallelogram opposite angles are equal and that's why angle e = 80

By adding angle e ,

a + b + c + d + e = 280°

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Option ( C ) is correct