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Question
ABCD is a parallelogram in which ∠A = 70°. Compute ∠B, ∠C and ∠D .
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Solution
In a parallelogram ABCD.
`∠`A = 70°
`∠`A = `∠`B = 180° [ ∴ Adjacent angles supplementary]
70° + `∠`B = 180° `∠`A = 70°]
`∠`B =180° - 70°
=110°
In a parallelogram opposite sides are equal
`∠`A = `∠`C = 70°
`∠`B = `∠`D = 110°
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