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Year 7 Maths - Geometry
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Gravity
Terms in this set (29)
point
Representation of a position, usually marked by a small round dot and named with a capital letter.
line
A line is a straight path that is infinite in length.
plane
A flat surface that extends endlessly in all directions.
colinear
Points that lie on the same straight line.
intersection point
Meet at a point; where lines cross one another.
concurrent
Lines that pass through the same point.
segment
A section of a straight line.
ray
A straight line that extends infinitely from one point, called its end point.
vertex
A point where two or more straight lines meet to make an angle.
arm
Line interval forming one side of an angle and having the vertex of the angle as an end point.
angle
Two rays starting from the same point; the measure of turn between two lines, measured in degrees.
acute angle
An angle measuring between 0° and 90°.
right angle
An angle of exactly 90°.
obtuse angle
An angle that measures between 90° and 180°.
straight angle
An angle of exactly 180°; an angle that forms a straight line.
reflex angle
An angle that measures between 180° and 360°.
revolution
An angle of exactly 360° (full circle; full turn).
protractor
A semicircular or circular tool for measuring or drawing angles.
adjacent angles
Angles that are next to one another. Adjacent angles share a common arm and vertex.
complementary adjacent angles
A pair of adjacent angles adding to 90°.
supplementary adjacent angles
A pair of adjacent angles that add to 180°.
vertically opposite
A pair of equal angles that are opposite each other across their common vertex, formed when two straight lines intersect.
perpendicular
At right angles to another line or surface.
tranversal
A line that cuts two or more lines.
corresponding
When two lines are crossed by another line (which is called the Transversal), the angles in matching corners are called corresponding angles. When the two lines are parallel corresponding angles are equal.
alternate angles
Pairs of angles that lie between two lines on alternate sides of a transversal that cuts the lines. When the two lines are parallel alternate angles are equal.
co-interior angles
A pair of angles lying between two lines on the same side of a transversal. When the two lines are parallel co-interior angles add to 180º.
parallel lines
Lines that run in the same direction with the same gradient that are the same distance apart and do not ever intersect.
skew
Lines that do not intersect and are not parallel.
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