What are the measures of ∠1, ∠2, ∠3 and∠4 ? Enter your answers in the boxes.

m∠1=_ m∠2=_ m∠3=_ m∠4=_

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step-by-step explanation:

m∠abd = m∠dbc

step-by-step explanation:

given : ab bisects ∠dbc

as we know that bisection means ab divides   ∠dbc   in two equal angles named as   ∠dba and   ∠abc

so, m∠abd = m∠dbc  

because ab bisects ∠dbc.

hence , the first statement m∠abd = m∠dbc is true.