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# Math Unit_3

### Geometry Explorations and the American Tour Vocabulary

Acute Angle An angle with a measure greater than 0 degrees and less than 90 degrees.
Adjacent Angles Angles that are next to each other; adjacent angles have a common side and a common vertex, but no other overlap.
Congruent Having exactly the same shape and size .Two 2-dimensional figures are congruent if they match exactly when one is placed on top of the other.
Diameter A line segment that passes through the center of a circle (or sphere) and has endpoints on the circle (or sphere). The diameter of a circle or sphere is twice the length of its radius.
Equilateral Triangle A triangle with all three sides the same length. In an equilateral triangle, all three angles have the same measure.
Obtuse Angle. An angle with a measure greater than 90 degrees and less than 180 degrees.
Radius A line segment from the center of a circle (or sphere) to any point on the circle (or sphere).
Right Angle An angle with a measure of 90 degrees.
Tessellation An arrangement of shapes that covers a surface completely without overlaps or gaps. Also called tiling.
Vertical (Opposite) Angles The angles made by intersecting lines that do not share a common side. Vertical angles have equal measures.
Created by: mrsthompson