Archaeology an archaeologist discovers the
two artifacts shown.
a. what integer represents ground level?
b. a dinosaur bone is found 42 centimeters be
ground level. is it deeper than both of the artifacts?

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a reflection across the x axis and a 90 degree rotation left and right.

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.