Which cannot be used in a proof?
a. theorems
b. postulates
c. properties
d. undefined terms

D.Undefined Terms

Step-by-step explanation:

The reason in a mathematical proof can be a given information, vocabulary definitions, properties, postulates or previously proved theorems.

But the undefined terms are the terms which used in geometry to define other terms.

Therefore , the undefined terms cannot be used in a mathematical proof .

Hence , D is the correct option.

δabc ≅ δdcb by sas because

db ≅ ac . . given (side)

bc ≅ bc . . reflexive property (side)

∠dbc ≅ ∠ acb . . alternate interior angles where transversal bc crosses parallel lines bd and ac (included angle)

95.03 is the answer. hope this !