A triangle ABC is drawn on your sheet.
a. (i) State the linear pair axiom.
b. (ii) Produce side BC to a point D. Using only straight-line properties, write a clear paragraph explanation to show that ∠A+∠B+∠C=180∘.
c. (iii) In one or two sentences, explain why the reasoning you used in part (ii) is called a deductive argument.