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Question

If figure, $A B ∥ C D$ . Determine $∠ a$

$53^{o}$
$73^{o}$
$83^{o}$
$93^{o}$

A

93^{o}

B

53^{o}

C

73^{o}

D

83^{o}

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Solution

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ABCD, Draw a line l parallel to AB.
From figure $∠ 1 = 55^{o} a n d ∠ 2 = 38^{o}$
$∠ a = ∠ 1 + ∠ 2$
$∠ a = 55^{o} + 38^{o} = 93^{o}$

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