[Answer] The vertex angle of an isosceles triangle measures 40°. What is the measure of a base angle?

Answer: b. 70°

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The vertex angle of an isosceles triangle measures 40°. What is the measure of a base angle? An isosceles triangle is a triangle with two equal sides. When two sides are equal two of its angles will be also equal. This are the base angles of the triangle. Let one of the base angle = x. Vertex angle is given a 40°. Angles in a triangle add up to 180°. ∴ 180 = 40 + x + x. 180 = 40 + 2x. Angle Y is a right angle . The measure of angle Z is 45° The perpendicular bisector of XZ creates two smaller isosceles triangles . An isosceles triangle is a triangle with two equal sides. When two sides are equal two of its angles will be also equal. This are the base angles of the triangle. Let one of the base angle = x . Vertex angle is given a 40° . Angles in a triangle add up to 180° ∴ 180 = 40 + x + x 180 = 40 + 2x 2x = 180 - … The vertex angle of an isosceles triangle measures 40 degrees? What is the measure of the base angle ? XXX 100 XXX 40 . Triangle ABC is an isosceles right triangle . What is the measure of a base angle ? XXX 80. What is the length of line segment AC? XXX 7. What is true about triangle AMB? If it is an isosceles triangle then the base angles must be equal angles of 69 degrees because there are 180 degrees in a triangle and 42+69+69 = 180 degrees The vertex angle is 40 degrees less than the sum of the base angles. v = b+b−40 = 2b−40 The sum of the measu...

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