# Quick Answer: What Best Describes A Triangle?

## What describes an isosceles triangle?

An isosceles triangle therefore has both two equal sides and two equal angles.

The name derives from the Greek iso (same) and skelos (leg).

A triangle with all sides equal is called an equilateral triangle, and a triangle with no sides equal is called a scalene triangle..

## How do you classify a triangle?

Equilateral triangle. The Equilateral triangle shown on the left has three congruent sides and three congruent angles. … Isosceles triangle. The Isosceles triangle shown on the left has two equal sides and two equal angles.Scalene Triangle. The Scalene Triangle has no congruent sides. … Acute Triangle. … Obtuse Triangle.

## What is triangle and its types?

Triangles are shapes with three sides. … A triangle’s type depends on the length of its sides and the size of its angles (corners). There are three types of triangle based on the length of the sides: equilateral, isosceles, and scalene. The green lines mark the sides of equal (the same) length.

## What is the measure of the unknown angle?

To determine to measure of the unknown angle, be sure to use the total sum of 180°. If two angles are given, add them together and then subtract from 180°. If two angles are the same and unknown, subtract the known angle from 180° and then divide by 2.

## What is unique about a triangle?

When only one triangle can be made it is classified as a UNIQUE triangle. Conditions One Two Infinitely Many No side lengths are given One side length and one angle measure is given.

## What describes a triangle?

A triangle is a polygon with three edges and three vertices. It is one of the basic shapes in geometry. A triangle with vertices A, B, and C is denoted . In Euclidean geometry, any three points, when non-collinear, determine a unique triangle and simultaneously, a unique plane (i.e. a two-dimensional Euclidean space).

## What term best describes the triangle?

Vocabulary Language: English ▼ EnglishTermDefinitionIsosceles TriangleAn isosceles triangle is a triangle in which exactly two sides are the same length.Obtuse TriangleAn obtuse triangle is a triangle with one angle that is greater than 90 degrees.Right AngleA right angle is an angle equal to 90 degrees.5 more rows•Jul 18, 2012

## Is an acute angle?

Acute angles are less than 90 degrees, obtuse angles are more than 90 degrees, and right angles are exactly 90 degrees.

## What are 3 characteristics of an obtuse triangle?

Properties of Obtuse TrianglesThe longest side of an obtuse triangle is the one opposite the obtuse angle vertex.An obtuse triangle may be either isosceles (two equal sides and two equal angles) or scalene (no equal sides or angles).An obtuse triangle has only one inscribed square.More items…•

## What is the formula of a isosceles triangle?

List of Formulas to Find Isosceles Triangle AreaFormulas to Find Area of Isosceles TriangleUsing base and HeightA = ½ × b × hUsing all three sidesA = ½[√(a2 − b2 ⁄4) × b]Using the length of 2 sides and an angle between themA = ½ × b × c × sin(α)2 more rows

## What is the height of an isosceles triangle?

Plug this value in to find the length of the base. Now, recall that the height of an isosceles triangle can split the entire triangle into two congruent right triangle as shown by the figure below. Thus, we can use the Pythagorean Theorem to find the length of the height.

## What is special about a triangle?

Triangles are special because they are exceptionally strong. Out of all the two-dimensional shapes we can make out of straight struts of metal, only a triangle is rigid.

## What are 3 attributes that describe a triangle?

An equilateral triangle has three sides of equal length and three equal angles. An isosceles triangle has two sides of equal length and two equal angles. A scalene triangle has no sides of equal length and no equal angles. A right angle triangle has one angle that is 90 degrees.

## What must be true about a scalene triangle?

A triangle where all three sides are different in length. … The interior angles of a scalene triangle are always all different. The converse of this is also true – If all three angles are different, then the triangle is scalene, and all the sides are different lengths.