Posts tagged geometry
Finding the circumference of a circle

The circumference of a circle is the distance around the circle (its perimeter). You can find the circumference if you know either the radius or the diameter.

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Vertical angles as congruent angles

Vertical angles are angles in opposite corners of intersecting lines. So vertical angles always share the same vertex, or corner point of the angle. They’re a special angle pair because their measures are always equal to one another, which means that vertical angles are congruent angles.

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Intersecting tangents and secants of circles, intersecting inside the circle and outside the circle

There’s a special relationship between two secants that intersect outside of a circle. The length outside the circle, multiplied by the length of the whole secant is equal to the outside length of the other secant multiplied by the whole length of the other secant.

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Midsegments of triangles and the triangle midsegment theorem

The midsegment in a triangle is a line drawn across the triangle from one side to another, parallel to the side it doesn’t touch. The difference between any other side-splitting segment and a midsegment, is that the midsegment specifically divides the sides it touches exactly in half.

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Transversals, and their special angle pairs

In this lesson we’ll look at the angles formed when a pair of parallel lines is crossed by another line, called a “transversal.” When transversals cross parallel lines, they form angles with special angle relationships.

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Using translation vectors to transform figures

Translation vectors translate figures in two-dimensional space, from one location to another. The initial point and terminal point of the translation vector are irrelevant. What matters is the length of the vector and the direction in which it points.

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