A triangle is a polygon, which is a closed shape like a square or a hexagon, but a triangle has only three sides. Triangle comes from the Latin word triangulus, “three-cornered” or “having three angles,” from the roots tri-, “three,” and angulus, “angle or corner.”

adjective. pertaining to or having the form of a triangle; three-cornered. having a triangle as base or cross section: a triangular prism.

Noun. (anatomy) Ellipsis of scalene muscle. (trigonometry) Ellipsis of scalene triangle.

of a triangle. : having the three sides of unequal length — see triangle illustration.

Scalene triangles have three unequal angles. The shortest side is across from the smallest angle, The medium side is across from the medium angle, The longest side is across from the largest angle.

Scalene triangles are triangles with sides of different lengths or simply a triangle with noncongruent sides. For example, a triangle of side lengths of 2 cm, 3 cm, and 4 cm can be considered a scalene triangle.

Some of the important properties of the scalene triangle are as follows:

1. It has no equal sides.
2. It has no equal angles.
3. It has no line of symmetry.
4. It has no point symmetry.
5. The angles inside this triangle can be an acute, obtuse or right angle.

Note: It is possible for a right triangle to also be scalene or isosceles. An obtuse triangle has one angle measuring more than 90º but less than 180º (an obtuse angle). It is not possible to draw a triangle with more than one obtuse angle. Note: It is possible for an obtuse triangle to also be scalene or isosceles.

A triangle can have at most one right angle, or an angle that has a measure of 90°.

There are three types of special right triangles, 30-60-90 triangles, 45-45-90 triangles, and Pythagorean triple triangles.

Properties of Right – Angled Triangle

• One angle of the triangle always measures 90degree.
• The hypotenuse is the longest side of the right-angle triangle.
• The side that is opposite to the 90degree angle is the hypotenuse.
• The Sum of two interior angles of the right-angled triangle is always 90degree.

The right triangle has one 90 degree angle and two acute (< 90 degree) angles. Since the sum of the angles of a triangle is always 180 degrees…

From Wikipedia, the free encyclopedia. A right triangle (American English) or right-angled triangle (British), or more formally an orthogonal triangle (Greek: ὀρθόςγωνία, lit. ‘upright angle’), is a triangle in which one angle is a right angle (that is, a 90-degree angle).

Right triangles are triangles in which one of the interior angles is 90 degrees, a right angle. Since the three interior angles of a triangle add up to 180 degrees, in a right triangle, since one angle is always 90 degrees, the other two must always add up to 90 degrees (they are complementary).

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).

Six Types of Triangles

A triangle is a three-sided polygon that closes in a space. It uses lines, line segments or rays (in any combination) to form the three sides. When three sides form and meet, they create three vertices, or corners. The corners inside the triangle are interior angles.

The definition of a triangle is a shape with three angles and three sides. An example of something in the shape of a triangle is a piece of pizza. Any three-sided or three-cornered figure, area, object, part, etc.

When classifying a triangle by its sides, you should look to see if any of the sides are the same length. If no sides are the same length, then it is a scalene triangle. If two sides are the same length, then it is an isosceles triangle. If all three sides are the same length, then it is an equilateral triangle.

Isosceles Triangle: It has two equal sides. Also, the angles opposite these equal sides are equal. Equilateral Triangle: All the sides are equal and all the three angles equal to 60°….Types of Triangle.

The sides of a triangle rule asserts that the sum of the lengths of any two sides of a triangle has to be greater than the length of the third side. See the side lengths of the acute triangle below. The sum of the lengths of the two shortest sides, 6 and 7, is 13.

hexagon

icosagon

hectogon

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