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Using Euclid's Propositions I.1-I.17, solve the following questions: (a) One of the angles of triangle ABC...

Using Euclid's Propositions I.1-I.17, solve the following questions:

(a) One of the angles of triangle ABC is obtuse. Prove that the other two are acute.

(b) Prove that the angles at the base of an isoscles triangle are acute

(c) Prove that every triangle has at least one altitude that is interior to it.

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