given that cos 0= -square root of 3/2, pi/2
(a) sin (20) (b) cos (20) (c) tan(20)

nlgqer

step-by-step

thats one

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.