High School Geometry Vocabulary
52 terms from 14 sources on LivePhysics. High School level.
High School Geometry Vocabulary
Geometry · High School · 52 terms
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Start in flip mode and read each definition before you turn the card over. Rate a term "Again" if you had to guess, so it comes back around sooner in your next pass. Once you can flip through a round without hesitating, switch to quiz mode to check that the terms stick without the definition in front of you.
Understanding High School Geometry Vocabulary
This vocabulary set covers a major idea in high school geometry. Shapes can be studied as drawings, measurements, or locations on a coordinate grid. The terms help you move between those views.
An ordered pair places a point, and the origin gives the grid a fixed starting place. Quadrants help describe where points lie. Slope describes how a line changes as it moves across the grid.
Midpoint and the distance formula turn a picture into measurable information. These ideas matter in proofs, graphing, construction, design, and problems involving real locations.
Right triangles form a core part of this unit because their side lengths have a dependable relationship. The legs meet at the right angle, while the hypotenuse faces that angle. When you identify those sides correctly, you can use the Pythagorean Theorem to find a missing length.
Pythagorean triples are useful because they give known whole-number side lengths that work without much calculation. Right triangles also lead to trigonometric ratios. In a problem, opposite and adjacent are not permanent labels for a side.
They depend on which acute angle you are using. This is a common source of mistakes. First mark the chosen angle, then identify the hypotenuse, opposite side, and adjacent side.
Similarity and transformations explain how figures can change while keeping important structure. Congruent figures have exactly the same size and shape. Similar figures keep the same shape but may have different sizes.
Corresponding parts show which angles and sides match between figures. A scale factor tells how lengths change in a dilation, and the center of dilation controls where that enlargement or reduction is based. Orientation helps you notice whether a transformation has reversed a figure.
Similar triangles are especially powerful because matching angles create proportions between matching sides. Included angle matters when an angle sits between two known sides. Careful diagrams and matching marks make these relationships easier to see.
Not every triangle has a right angle. An oblique triangle may require the Law of Sines or the Law of Cosines instead of a right-triangle method. Angle of elevation, angle of depression, line of sight, and horizontal line describe measurement situations such as viewing a building or a distant object.
Composite figures require you to decompose a complicated region into familiar pieces, then use the correct base and height or other measurements for each piece. Study this deck by sorting terms into groups such as coordinate geometry, right triangles, transformations, and measurement. Draw a small sketch for each group.
Say what information a term helps you find, not only what it means. Then practice choosing a method from a diagram, since selecting the right tool is the main skill these words support.