# Which characteristics will prove that Δdef is a right isosceles triangle?

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Answer: The lengths of DE and EF are congruent, and their slopes are opposite reciprocals.

## What formula do you use to prove a triangle is a right triangle?

The converse of Pythagorean Theorem states that if three sides of a triangle are a, b and c such that a2+b2=c2, then the triangle is right angled. Proof: There are many proofs for this but you can use Pythagorean theorem to prove this. Let the triangle ABC have side lengths a, b and c such that a2+b2=c2.

## How do you use the distance formula to classify a triangle?

How do you use the distance formula and slope formula to classify a triangle? We can use the length of The sides of a triangle using distance formula. if the length of all three sides are equal then it’s equal it’s an equilateral triangle. if the length of any two sides are equal then it’s an isosceles triangle.

## How can you prove a triangle is a right triangle Brainly?

Use the distance formula to see if at least two sides are congruent. Use the slope formula to see if any sides are perpendicular. Use the distance formula to see if all three sides are congruent.

## Which formula would you use to see if the sides are congruent?

Recall the SSS Congruence Theorem: If three sides of one triangle are congruent to three sides of a second triangle, then the two triangles are congruent. Given two triangles on a coordinate plane, you can check whether they are congruent by using the distance formula to find the lengths of their sides.

## How can you prove a triangle is isosceles?

If a triangle has two congruent angles, then the sides opposite those angles are congruent. In other words, iso-angular triangles are iso-lateral (isosceles). This is the converse of the isosceles triangle theorem.

## How can you prove a triangle is isosceles Brainly?

You can prove a triangle is isosceles by using the distance formula to see if at least two sides are congruent. It is a triangle that has two sides of equal length. Hope this answers the question. Have a nice day.

## How could you use coordinate geometry to prove that BC ad?

How could you use coordinate geometry to prove that BC || AD? Prove the slopes are the same. Prove the slopes are opposite reciprocals. Prove the lengths are the same.

## Which statement explains how you could use coordinate geometry to prove the opposite?

The statement explains how you could use coordinate geometry to prove the opposite sides of a quadrilateral are congruent is, Use the distance formula to prove the lengths of the opposite sides are the same.

## How do you complete a Coordinate Geometry Proof?

When developing a coordinate geometry proof:

1. Plot the points, draw the figure and label.
2. State the formulas you will be using.
3. Show ALL work.
4. Have a concluding sentence stating what you have proven and why it is true. Usually a theorem or a definition is needed here.

## How can you prove a triangle is an equilateral triangle?

The Equilateral Triangle has 3 equal sides. The Equilateral Triangle has 3 equal angles. The total sum of the interior angles of a triangle is 180 degrees, therefore, every angle of an equilateral triangle is 60 degrees.

## How do you prove a right triangle?

Proof of Right Angle Triangle Theorem Theorem:In a triangle, if square of one side is equal to the sum of the squares of the other two sides, then the angle opposite the first side is a right angle. Hence the theorem is proved.

3

four vertex

## What are the 7 triangles?

To learn about and construct the seven types of triangles that exist in the world: equilateral, right isosceles, obtuse isosceles, acute isosceles, right scalene, obtuse scalene, and acute scalene.

## What is a triangle called with 2 equal sides?

isosceles triangle

## What are the three types of triangle?

We can classify triangles into 3 types based on the lengths of their sides:

• Scalene.
• Isosceles.
• Equilateral.

## What is a triangle with 3 equal sides called?

equilateral triangle

## What are the 3 triangles called?

There are three types of triangle based on the length of the sides: equilateral, isosceles, and scalene.

## What is a true triangle?

A triangle has three sides, three vertices, and three angles. The sum of the three interior angles of a triangle is always 180°. The sum of the length of two sides of a triangle is always greater than the length of the third side.

## Can 1 acute and 2 obtuse form a triangle?

Types of Triangles. All equilateral triangles are equiangular. A right triangle will have 1 right angle and 2 acute angles. An obtuse triangle will have 1 obtuse triangle and 2 acute angles.

## How do you find two sides of a right triangle?

Key Points

1. The Pythagorean Theorem, a2+b2=c2, a 2 + b 2 = c 2 , is used to find the length of any side of a right triangle.
2. In a right triangle, one of the angles has a value of 90 degrees.
3. The longest side of a right triangle is called the hypotenuse, and it is the side that is opposite the 90 degree angle.

## Can you have a triangle with two right angles?

No, a triangle can never have 2 right angles. A triangle has exactly 3 sides and the sum of interior angles sum up to 180°. Thus, it is not possible to have a triangle with 2 right angles.

## Can a triangle have one right angle and one obtuse angle?

A triangle cannot be right-angled and obtuse angled at the same time. Since a right-angled triangle has one right angle, the other two angles are acute. Therefore, an obtuse-angled triangle can never have a right angle; and vice versa. The side opposite the obtuse angle in the triangle is the longest.

## Can you have a triangle with 2 obtuse angles?

The answer is “No”. Reason: If a triangle has two obtuse angles, then the sum of all the 3 interior angles will not be equal to 180 degrees.

## Why can you only have one obtuse angle in a triangle?

An obtuse triangle (or obtuse-angled triangle) is a triangle with one obtuse angle (greater than 90°) and two acute angles. Since a triangle’s angles must sum to 180° in Euclidean geometry, no Euclidean triangle can have more than one obtuse angle.

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