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An enlargement is a type of transformation that involves making a shape larger. This transformation is an example of enlargement, as the triangle is being enlarged.

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In geometry, a semicircle is a one-dimensional locus of points that forms half of a circle. Below is what half of a ferris wheel, a semicircle, looks like.

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A sphere is a geometrical object in three-dimensional space that is the surface of a ball. An example of a sphere is a beach ball.

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A theorem is a true statement that can be proven. An example of a theorem is the Pythagorean Theorem

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A converse in geometry is when you take an conditional statement and reverse the premise “if x” and the conclusion “then y”. These are some examples of converse statements in geometry.

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A line segment has two endpoints; that is, it has a starting point and an ending point, much like a dead-end street. Bisector means to divide, not just in two, but in halves, or two equal parts. Therefore, a segment bisector is a point, a line, a ray, or a line segment that bisects another line segment.

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In geometry, a ray is a line with a single endpoint (or point of origin) that extends infinitely in one direction. This is an example of light rays.

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In geometry, an intersection is a point, line, or curve common to two or more objects (such as lines, curves, planes, and surfaces). As you can see below, this is an example of an intersection in the real world.

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In geometry, congruent angles share the same angle (in degrees/radians). They don't have to point in the same direction. They don't have to be on similar sized lines. An example of congruent angles can be seen below.

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In geometry, an acute angle is an angle which has a measure of less than 90 degrees.
This example shows what an acute angle looks like.