Write an informal negation for each of the following statements. Be careful to avoid negations that are ambiguous. a. All dogs are friendly. b. All people are happy. c. Some suspicions were substantiated. d. Some estimates are accurate.

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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.