In parallelogram abcd, ∠a and ∠b are adjacent. the measure of ∠b is twice the measure of ∠a. which equation gives the exact measure of ∠a? a.  m ∠a + m ∠b = 180°b.m ∠a + 2 • m ∠a = 180°c.m ∠a + m ∠b = 90d.m ∠a + 2 • m ∠a = 90°

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