# Geometry Vocabulary

### Description

geometry vocabulary flashcards
Flashcards by patticlj, updated more than 1 year ago
 Created by patticlj over 8 years ago
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## Resource summary

 Question Answer parallel lines Parallel lines are always the same distance apart, and will never touch. perpendicular lines Perpendicular lines meet or cross to form right (90 degree) angles. straight angle Straight angles are also known as straight lines, and measure 180 degrees. acute angle An acute angle measures more than 0 degrees, but less than 90 degrees. obtuse angle An obtuse angles measures more than 90 degrees, but less than 180 degrees. right angle A right angle measures exactly 90 degrees. Right angles are sometimes called "square corners", because they look like the corners of a square or a rectangle. triangle A triangle is a polygon with exactly three sides and three angles. acute triangle An acute triangle is a triangle whose three angles are ALL acute angles (less than 90 degrees). obtuse triangle A triangle with exactly ONE obtuse angle. (More than one obtuse angle would mean the three angles could not add up to 180 degrees.) right triangle A triangle with exactly ONE right angle. (More than one right angle would mean the three angles could not add up to 180 degrees.) equilateral triangle A triangle whose three sides are ALL the same length. (Also called an equiangular triangle, because the three angles would also have equal measures.) isosceles triangle A triangle with two (or three) sides being equal in length. scalene triangle A triangle whose three sides all have different lengths. quadrilateral A polygon having exactly four sides and four angles. parallelogram A quadrilateral whose opposite sides are both congruent (equal in length) and parallel. Rectangles, squares, and rhombuses (rhombi) are all special types of parallelograms. rectangle A parallelogram whose four angles are all right angles. rhombus A parallelogram whose four sides are all congruent. square A parallelogram whose four sides are all congruent (making it also a rhombus) and whose four angles are all right angles (making it a rectangle). trapezoid A quadrilateral with EXACTLY ONE pair of parallel sides - the other pair is NOT parallel, so a trapezoid is not a parallelogram. pentagon A polygon with 5 sides and 5 angles. hexagon A polygon with 6 sides and 6 angles.

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