A triangle is three points that do not lie on one straight line, connected by segments.
An isosceles triangle is a triangle in which the sides are equal, and the angles at the base are also equal:
AB = BC;
∠А = ∠С.
Since the sum of all the angles of the triangle is 180º, then:
∠А + ∠В + ∠С = 180º;
∠А = ∠С = (180º – ∠В) / 2;
∠А = ∠С = (180º – 30º) / 2 = 150º / 2 = 75º.
Answer: The angles at the base of the triangle are 75 degrees.
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