Question

How can you determine m∠ABD and m∠DBC if you know m∠ABC and you know m∠ABD=½m∠ABC ?

Answer 1

Explanation:

m∠ABD=½m∠ABC

So, BD is the angle bisector of ∠ABC.

∠ABD = ∠DBC

So, if we know ∠ABC, then we can find ∠ABD & ∠DBC

Eg: If ∠ABC = 50, then ∠ABD = 50/2 = 25

As ∠DBC = ∠ABD

∠DBC = 25