When 2 lines or heat segment Intersect four angles are formed.Two pair of angles develops linear pair that is amount of their angle is same to 180°.The pair that do not kind linear pair space vertical or vertically opposite angles.

You are watching: What is always true about the angles of an isosceles triangle?

So, A Pair of vertically opposite angles are constantly equal to every other.

In the number below

∠1=∠2

∠3=∠4

are vertically the contrary angles.

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B. At the very least two the the angles room congruent.

Step-by-step explanation:

We are asked to pick the correct option about the angle of an isosceles triangle. Let us see our given options one by one.

A. All three angles room congruent.

We know that all angle of an equilateral triangle are equal. We know that every equilateral triangle is one isosceles triangle together it 3 congruent angles.

For a triangle to be an isosceles triangle at the very least two angles requirements to be congruent, therefore, the provided statement is not true.

B. At least two the the angles are congruent.

For a triangle to be an isosceles triangle at least two angles needs to it is in congruent, therefore, the given statement is true.

C. The vertex edge is a appropriate angle.

The vertex edge is not constantly a best angle as when each basic angle of isosceles triangle is 50 degree, then vertex angle will be 80 degrees, therefore, the offered statement is not always true.

D. The vertex angle is obtuse.

The vertex edge is not constantly an obtuse angle as when each base angle that isosceles triangle is 70 degree, climate vertex angle will be 40 degrees, therefore, the offered statement is not constantly true.



B.At least two that the angles room congruent.

Step-by-step explanation:

Isosceles triangle : that is that triangle in which 2 sides the triangle are same.

In other words ,we have the right to say the

Isosceles triangle is the triangle in which 2 angles of the triangle room equal.

A.All 3 angles room congruent.

It is not true since it is not vital that all three angles space congruent.

B.At the very least two that the angles are congruent.

It is true by definition of isosceles triangle.

C.The vertex edge is a right angle.

It is no true because it is not important that the vertex edge is a appropriate angle.

D.The vertex edge is obtuse.

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It is no true since it is not necessary that the vertex angle is a right angle.