A 40 cm gold chain is used to form an isosceles triangle. The base side is made to be 18 cm long. What are the
measures, to the nearest tenth of a degree, of the largest
angle in the triangle?

the answer is a

step-by-step explanation:

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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)