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Sagot :
Therefore the solution to the given problem is the each of the congruent base angles is 70°
What is angle?
In Euclidean geometry, an angle is the figure generated by two rays, called the sides of the angle, sharing a common termination, called the vertex of the angle. Angles created by two rays are in the plane where the rays are located. The intersection of two planes also forms angles. We refer to these as dihedral angles.
Here,
As the triangle is an isosceles triangle therefore it will have 2 same angles
thus,
Sum of the 3 angles of a triangle=180°
Vertex angle =40°
Sum of two congruent angles=180°–40°=140°
Measure of each base angle=70°
Therefore the each of the congruent base angles is 70°
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