If BD is the angle bisector of ∠ABC, and ∠ABD = 25°, then what is the measure of ∠ABC ?

50°

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25°

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60°

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90°

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Solution

The correct option is A
50°

Since BD is angle bisector of angle ABC,
$∴ ∠ A B C = 2 \times ∠ A B D$

= 2 $\times 25 = 50^{\circ}$

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If BD is the angle bisector of ∠ABC, and ∠ABD = 25°, then what is the measure of ∠ABC ?

The correct option is A 50° Since BD is angle bisector of angle ABC, ∴∠ABC=2×∠ABD = 2 ×25=50∘

The correct option is A
50°

Since BD is angle bisector of angle ABC,
$∴ ∠ A B C = 2 \times ∠ A B D$

= 2 $\times 25 = 50^{\circ}$