* Your assessment is very important for improving the workof artificial intelligence, which forms the content of this project
Download Topic 12 Vocabulary p.2 point
Duality (projective geometry) wikipedia , lookup
Technical drawing wikipedia , lookup
Tessellation wikipedia , lookup
Euler angles wikipedia , lookup
Multilateration wikipedia , lookup
Perspective (graphical) wikipedia , lookup
Approximations of π wikipedia , lookup
List of regular polytopes and compounds wikipedia , lookup
Reuleaux triangle wikipedia , lookup
History of trigonometry wikipedia , lookup
Perceived visual angle wikipedia , lookup
Line (geometry) wikipedia , lookup
Trigonometric functions wikipedia , lookup
Integer triangle wikipedia , lookup
Complex polytope wikipedia , lookup
Rational trigonometry wikipedia , lookup
Pythagorean theorem wikipedia , lookup
Area of a circle wikipedia , lookup
Topic 12 Vocabulary Lesson 12-1 line segment –a piece of line with two ends. ray –a piece of line with one end, and the other goes on forever. parallel lines –two lines are parallel if they would never cross even if they went on forever. (In a plane, lines that never cross and stay the same distance apart.) intersecting lines –two lines are intersecting if they would ever cross. (lines that pass through the same point.) perpendicular lines –two lines that intersect to form right angles (90*) or square corners. Topic 12 Vocabulary p.2 point –a point is one little place. (an exact location in space.) line –a line goes on forever. (a set of points that goes on forever in two directions.) plane –a plane is a flat surface that goes on forever. (an endless flat surface.) Lesson 12-2 angle –an angle is the distance we measure at a vertex. (Two rays that have the same endpoint.) vertex –a vertex is a place where two lines, line segments, or rays intersect. (The point where two rays meet in an angle.) degree ( ) –a unit of measure for angles. Topic 12 Vocabulary, p.3 protractor –an instrument used to measure and draw angles. acute angle –an acute angle has LESS than 90 degrees. (-an angle whose measure is between 0 and 90 degrees.) right angle –a right angle has EXACTLY 90 degrees. obtuse angle –an obtuse angle has MORE than 90 degrees. (-an angle whose measure is between 90 and 180 degrees.) straight angle –a straight angle has 180 degrees. Topic 12 Vocabulary, p.4 Lesson 12-3 polygon –a polygon has straight sides joined together. The sides are line segments. They are joined at vertices. regular polygon –a regular polygon is polygon where all of the sides and all of the angles are equal. Multiplication is an easy way to find the perimeter of a regular polygon. triangle –a triangle is a 3-sided polygon. quadrilateral –a quadrilateral is a 4-sided polygon. pentagon –a pentagon is a 5-sided polygon. hexagon –a hexagon is a 6-sided polygon. heptagon –a heptagon is a 7-sided polygon. Topic 12 Vocabulary, p.5 octagon –an octagon is an 8-sided polygon. nonagon –a nonagon is a 9-sided polygon. decagon –a decagon is a 10-sided polygon. Lesson 12-4 equilateral triangle –an equilateral triangle is 3-sided polygon with all 3 sides equal. isosceles triangle –An isosceles triangle is a 3-sided polygon with two of its sides equal. scalene triangle –a scalene triangle is a 3-sided polygon with NONE of its sides equal. right triangle –a right triangle is a 3-sided polygon with one right angle. The right angle is 90 degrees. Topic 12 Vocabulary, p.6 acute triangle –an acute triangle is a 3-sided polygon with all acute angles. An acute angle is less than 90 degrees. obtuse triangle – an obtuse triangle is a 3-sided polygon with one obtuse angle. An obtuse angle is greater than 90 degrees. Lesson 12-5 parallelogram –a parallelogram is a 4-sided polygon with two pairs of parallel sides. (both pairs of opposite sides are parallel) trapezoid –a trapezoid is a 4-sided polygon with one pair of parallel sides. rectangle –a rectangle is a 4-sided polygon with two pairs of parallel sides, two pairs of equal sides, and four right angles. Topic 12 Vocabulary, p.7 rhombus –a rhombus is 4-sided polygon with two pairs of parallel sides and 4 equal sides. square –a square is a 4-sided polygon with two pairs of parallel sides, four equal sides, and four right angles. Lesson 12-6 solid figure –is a figure that has three dimensions and takes up space. cube –a cube is a solid figure with 6 flat surfaces called faces. All the faces are squares. face –a flat surface of a polyhedron (a solid bounded by polygons). edge –a line segment where two faces meet in a solid figure. Topic 12 Vocabulary, p.8 vertex –a vertex is a place where two lines, line segments, or rays intersect. (the point where 3 or more edges of a solid figure meet.) prism –a prism is a polygon that grows straight up. A prism is a 3-dimensional polygon with sides that stay parallel. (a solid figure with two congruent parallel bases and faces that are parallelograms.) cylinder –A cylinder is a circle that grows straight up. A cylinder is a 3-dimensional circle with sides that stay parallel. (a solid figure with two circular bases that are congruent and parallel. cone –A cone is a circle that grows up to a point. A cone is a 3-dimensional circle with sides that meet. (a solid figure with one circular base, the points on the circle are joined to one point outside the base.) Topic 12 Vocabulary, p.9 pyramid –a pyramid is a polygon that grows up to a point. A pyramid is a 3dimensional polygon with sides that meet. Lesson 12-7 net –a plane figure which, when folded, gives the original shape of a solid. Lesson 12-9 generalization –a general statement that can be made about something.