# What theorem is an isosceles triangle?

## What theorem is an isosceles triangle?

The Isosceles Triangle Theorem states: If two sides of a triangle are congruent, then angles opposite those sides are congruent.

## What is isosceles triangle and its formula?

In geometry, the isosceles triangle formulas are defined as the formulas for calculating the area and perimeter of an isosceles triangle. Area = 1/2 × Base × Height. Area = b2√a2−b24 b 2 a 2 − b 2 4. Area = 1/2 ×abSinα

What are 3 properties of an isosceles triangle?

An Isosceles Triangle has the Following Properties:

• It has two sides of equal length.
• The angles opposite to equal sides are equal in measure.
• The altitude from vertex A to the base BC is the perpendicular bisector of the base BC.
• The altitude from vertex A to the base BC is the angle bisector of the vertex angle ∠ A.

### Which statement is true about isosceles triangle?

Every isosceles triangle has an axis of symmetry along the perpendicular bisector of its base. The two angles opposite the legs are equal and are always acute, so the classification of the triangle as acute, right, or obtuse depends only on the angle between its two legs….

Isosceles triangle
Properties convex, cyclic

### How do you prove an isosceles triangle is isosceles?

Hence proved. Theorem 2: Sides opposite to the equal angles of a triangle are equal. Proof: In a triangle ABC, base angles are equal and we need to prove that AC = BC or ∆ABC is an isosceles triangle….Isosceles Triangle Theorems and Proofs.

Reflection Symmetry Surface Area Of A Cone

What is the corollary of the isosceles triangle theorem?

Corollary of the Isosceles Triangle Theorems: Perpendicular to the Base. The straight line that passes through the vertex angle of an isosceles triangle and is perpendicular to the base bisects the base and the vertex angle.

#### How many sides isosceles triangle have?

two sides
A triangle with two sides of equal length is an isosceles triangle.

#### Which fact helps you prove the isosceles triangle theorem?

Which fact helps you prove the isosceles triangle theorem, which states that the base angles of any isosceles triangle have equal measure? If one angle of a triangle is larger than another angle, then the side opposite the larger angle is longer than the side opposite the smaller angle.

What is the importance of isosceles triangle?

An isosceles triangle is a triangle that has (at least) two equal side lengths. If all three side lengths are equal, the triangle is also equilateral. Isosceles triangles are very helpful in determining unknown angles.

## What is true of any triangle created by points UV?

What is true of any triangle created by points U, V, and any point on RT other than S? d. It will be an isosceles triangle.

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