Question

In triangle ABC, AB=AC, if triangle BAC=40 Degree, then measure of angle ABC is equal to _______​

Answer 1

Answer:

70

Step-by-step explanation:

As we know that 2 sides of this triangle are equal thus it's an isosceles triangle

It's a property in these triangles that the angle between same sides can be substracted from 180 and then halved to get the other 2 angles

Note: The 2 angles that are except the angle between same sides will be equal

SUBSTRACTING 40 FROM 180 WILL GIVE 140

And 70 is 140's half

Thus other two angles are 70

Answer 2

ANSWER

100°

Step-by-step explanation:

Given That

AB=AC

Angle BAC =40°

Angle ABC= ?

In triangle ABC

Angle A + Angle B + Angle C = 180° (since sum of all interior angles of a triangle

= 180°)

40° + x + 40°= 180° (since AB = AC)

80 + x = 180°

x = 180° - 80°

x = 100°

Therefore Angle ABC = 100°

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