How To Draw A Geometric Plane

Plane geometry is the study of figures on a 2-dimensional surface — that is, on a plane. You tin can recall of the plane as a piece of paper with no thickness at all. Technically, a plane doesn't end at the edge of the paper — it continues forever.

Making some points

A point is a location on a airplane. It has no size or shape. Although in reality a indicate is too modest to exist seen, you lot can represent it visually in a cartoon by using a dot. When two lines intersect, they share a single point. Additionally, each corner of a polygon is a betoken.

Knowing your lines

A line — also called a direct line — is pretty much what it sounds like; it marks the shortest distance between 2 points, simply it extends infinitely in both directions. Information technology has length but no width, making it a one-dimensional (ane-D) effigy.

Given whatever two points, you can describe exactly one line that passes through both of them. In other words, ii points determine a line.

When 2 lines intersect, they share a unmarried point. When two lines don't intersect, they are parallel, which ways that they remain the same altitude from each other everywhere. A expert visual aid for parallel lines is a ready of railroad tracks. In geometry, yous draw a line with arrows at both ends. Arrows on either end of a line mean that the line goes on forever.

A line segment is a slice of a line that has endpoints.

A ray is a slice of a line that starts at a signal and extends infinitely in 1 direction, kind of like a laser. It has one endpoint and i arrow.

Figuring the angles

An angle is formed when ii rays extend from the same point.

Angles are typically used in carpentry to measure the corners of objects. They're besides used in navigation to indicate a sudden change in direction. For example, when you're driving, information technology's mutual to distinguish when the angle of a turn is "sharp" or "not so sharp."

The sharpness of an angle is normally measured in degrees . The most common angle is the right angle — the bending at the corner of a square — which is a 90-degree angle:

Angles that take fewer than 90 degrees — that is, angles that are sharper than a right bending — are chosen acute angles, like this one:

Angles that measure greater than 90 degrees — that is, angles that aren't every bit precipitous as a right angle — are chosen obtuse angles, as seen here:

When an angle is exactly 180 degrees, it forms a directly line and is called a straight angle.

Shaping things up

A shape is whatsoever closed geometrical figure that has an inside and an outside. Circles, squares, triangles, and larger polygons are all examples of shapes.

Much of plane geometry focuses on different types of shapes.

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About the book author:

Marking Zegarelli is a math and test prep tutor and instructor. He is the writer of Bones Math & Pre-Algebra For Dummies, SAT Math For Dummies, ACT Math For Dummies, Logic For Dummies, and Calculus Two For Dummies.

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Source: https://www.dummies.com/article/academics-the-arts/math/basic-math/plane-geometry-points-lines-angles-and-shapes-149952

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