MATHEMATICS · Multi-part · CBSE · Mathematics · Introduction to Euclid's Geometry · Introduction to Euclid's Geometry
Problem
A triangle ABC is drawn on your sheet.
(i) State the linear pair axiom.
(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∘.
(iii) In one or two sentences, explain why the reasoning you used in part (ii) is called a deductive argument.