Question

solve for m∠abd.
answer attempt 1 out of 2
m∠abd = °

Explanation:

Step1: Observe angle relationships

We know that $\angle ABC = 137^{\circ}$ and $\angle DBC=77^{\circ}$. Also, $\angle ABC=\angle ABD+\angle DBC$.

Step2: Solve for $\angle ABD$

By the angle - addition postulate, $\angle ABD=\angle ABC - \angle DBC$. Substitute the given values: $\angle ABD = 137^{\circ}-77^{\circ}$.
$137 - 77=60$

Answer:

$60$