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# MMA Unit 8 Vocab

### Architecture and Spatial Reasoning

TermDefinition
Congruent Figures Two figures that are the same shape and same size. Corresponding sides and angles are equal.
Similar Figures Two figures that are the same shape but not necessarily the same size. Corresponding angles are equal, and the sides are proportional.
Proportion The relative sizes of two or more values; written as a fraction or with a colon between the values.
Scale Factor The ratio of the length of a side of one figure to the length of the corresponding side of the other figure.
1 Dimensional A figure that has only length and no width. It is only measured in one direction.
Distance How far apart two objects are.
2 Dimensional An object or figure which has length and width but no height. It is measured in 2 directions.
Area The space occupied by a flat shape; measured in square units
3 Dimensional An object or figure which has length and width and height. It is measured in 3 directions.
Volume The amount of space taken up by an object; measured in cubic units.
Surface Area The sum of the areas of all the surfaces of a 3D figure.
Pythagorean Theorem a^2+b^2=c^2 - the area of the square whose side is the hypotenuse is equal to the sum of the areas of the squares on the other two sides.
Hypotenuse In a right triangle, the side that is across from or not touching the right angle. Also, the longest side.
Leg In a right triangle, one of the two sides touching the right angle.
Right Triangle A triangle with one 90° angle.
Special Right Triangles A triangle with 30°-60°-90° angles or with 45°-45°-90° angles.
Distance Formula d=√[(x2-x1)^2+(y2-y1)^2 ]
Trigonometry A branch of mathematics that studies relationships between side lengths and angles of right triangles.
Opposite In English, on the other side. In a right triangle, the leg that is not touching or is across from the angle.
Adjacent In English, next to. In a right triangle, the leg that is touching or is next to the angle.
Theta (θ) Greek letter used as a variable for unknown degree of an angle.
SOHCAHTOA An acronym that helps you remember the trig formulas.
Sine (θ) opposite/hypotenuse
Inverse An operation that undoes another one.
Created by: meminot
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