Answer: b. 70°
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The vertex angle of an isosceles triangle measures 40°. What is the measure of a base angle?
A triangle has three angles and their measures add up to 180 degrees. An isosceles triangle has at least 2 congruent sides and the angles opposite the congruent sides are congruent. This triangle has one angle of 40 deg and two angles that measure the same; call the measure of each base angle x. x + x + 40 = 180.
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 - 40 …
Sat Nov 11 2017 · The vertex angle of an isosceles triangle measures 40°. What is the measure of a base angle ? - 6996230
A triangle has three angles and their measures add up to 180 degrees . An isosceles triangle has at least 2 congruent sides and the angles opposite the congruent sides are congruent. This triangle has one angle of 40 deg and two angles that measure the same; …
The vertex angle of an isosceles triangle measures 40 °. ... Triangle XYZ is isosceles . The measure of the vertex angle Y is twice the measure of a base angle . What is true about triangle XYZ? Check all that apply. Angle Y is a right angle .
Thu Apr 08 2010 · 180 minus the vertex angle of 40 equals 140 degrees left in the triangle . Since the base angles are equal we divide 140 by 2 and come up with 70 degrees. So th...
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