Geometry Ord Level Definitions
Quiz yourself by thinking what should be in
each of the black spaces below before clicking
on it to display the answer.
Help!
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| Plane | Flat two-dimensional surface. It has length and width but no thickness
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| Point | Position on a plane
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| Coplanar | If points lie on the same plane
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| Line | Straight, infinitely thin line that continues forever in both directions; it has no endpoints
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| Collinear points | points that lie on the same line
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| Perpendicular lines | Lines that are at right angles or 90 degrees to each other
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| Parallel lines | Lines that are the same distance apart. They never meet
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| Line segment | Part of a straight line. It has two endpoints and can be measured using a ruler
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| Ray | Part of a line that originates at a point and goes on forever in only one direction
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| Vertex | Where 2 rays meet
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| Acute angle | Angle less than 90 degrees
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| Right angle | 90 degree angle
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| Obtuse angle | angle greater than 90 degrees but less than 180 degrees
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| Reflex angle | Angle greater than 180 degrTees but less than 360 degrees
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| Null angle | 0 degrees
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| Full rotation | 360 degrees
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| Axiom | Statement that we accept without any proof. Without axioms there would be no starting point in theorems
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| Theorem | Rule that has been proven by following a certain number of logical steps or by using a previous theorem or axiom that you already know
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| Proof | Series of logical steps that we use to prove a theorem
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| Corollary | Reverse of a theorem
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| ImpliesH | Term we use in a proof when we can write down a fact that we have proven from our previous statements.
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| Vertically opposite angles | Angles that have the same vertex and are directly opposite each other
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| Transversal | Line that cuts two or more (usually parallel) lines
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| Equilateral triangle | All sides and angles are equal
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| Isosceles triangle | Two sides are the same length and two angles are the same size
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| Scalene | 3 different lengths and 3 different angles
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| Polygon | Closed shape (no gaps or openings) with straight sides. It has at least 3 sides
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| Quadrilateral | Four sided polygon
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| Parallelogram | Quadrilateral that has 2 pairs of parallel sides
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| Congruent triangles | All corresponding sides and interior angles are equal in measure
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| Pythagoras | Square on the hypotenuse is equal to the sum of the squares of the other 2 sides.
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| Area of triangle | Half the base multiplied by the perpendicular height
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| Area of parallelogram | Base multiplied by height
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| Circle | Set of points in a plane that are all equidistant from a fixed point, its centre
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| Radius | Line segment from the centre of the circle to any point on the circle
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| Chord | Any segment that joins two points on a circle
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| Diameter | Chord that passes through the centre of a circle. The diameter is twice the radius
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| Circumference | Perimeter or length of the circle
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| Tangent | A line which touches the circle at only one point
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| Sector | Region of the circle enclosed by two radii and the arc between these radii
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| Cyclic Quadrilateral | Measures of the opposite angles add up to 180 degrees
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You may also shuffle the rows of the table by clicking on the "Shuffle" button.
Or sort by any of the columns using the down arrow next to any column heading.
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Created by:
Holy Rosary College Mountbellew
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