Q:
# What is an opposite angle?

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### Quick Answer

Opposite angles, known as vertically opposite angles, are angles that are opposite to each other when two lines intersect. Vertically opposite angles are congruent, meaning they are equal in degrees of measurement. An angle measures the amount of rotation and can be expressed as degrees, radians and gradians. In some cases, the phrase "plane angle" is used to distinguish angles in a plane from angles in space.

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The angle has two basic parts, two lines and an intersecting point between them. The corner where the two lines meet is called the angle. The lines that intersect to form the angles are called the arms. The angle describes the amount of turn that takes place between each arm.

Angles can be named in two ways. The first is by a lowercase letter corresponding to where the angle is located, such as angle a or angle b. It is sometimes denoted with a letter from the Greek alphabet such as alpha. An angle can also be named by the letters that define the shape of the angle, with the middle letter indicating where the angle is located.

Angles can be given positive or negative signs, depending on the direction they follow when measured. Positive angles go counter clockwise while negative angles go clockwise.

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Q:
## Why do some shapes tessellate and others not?

A:Tessellations occur when a shape is repeated in an interlocking pattern that fully covers a flat surface, or plane, like the pieces of a puzzle. Some shapes cannot tessellate because they are not regular polygons or do not contain vertices (corner points). They therefore cannot be arranged on a plane without overlapping or leaving some space uncovered. Due to its rounded edges and lack of vertices, the circle is normally not tessellated.

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Q:
## Can a triangle have two acute angles?

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Full Answer >**A triangle can have two acute angles.**Some examples of triangle types that have two acute angles are a right triangle and an isosceles right triangle.Filed Under: -
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## How many vertices does a square have?

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Full Answer >**A square is a polygon with four vertices.**The shape has four equal sides and four 90-degree angles; thus, it is called a regular quadrilateral. The sides meet in four corners, which are called vertices.Filed Under: -
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## What were the contributions of Rene Descartes?

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Full Answer >**Rene Descartes, widely regarded as the father of modern philosophy, broke with the Aristotelian tradition, helping establish modern rationalism.**He argued for a mechanistic universe in opposition to Aristotle's views on causality. He also made important contributions to mathematics and physics.Filed Under: