Question
Find the supplementary/complementary angle
✓
Answer
$\angle A B D+\angle D B C=90^{\circ}$
$\angle A B D+30^{\circ}=90^{\circ}$
$\angle A B D=90^{\circ}-30^{\circ}$
$\angle A B D=60^{\circ}$
$\angle A B D+30^{\circ}=90^{\circ}$
$\angle A B D=90^{\circ}-30^{\circ}$
$\angle A B D=60^{\circ}$
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