Year 7 Maths:- Angles
Vertically Opposite Angles
Vertically opposite angles are the angles opposite each other when two lines cross. They are always equal to each other.
Perpendicular line
When two lines intersect at 90 degrees (right angles)
Parallel lines
When two lines run side by side always the same distance apart
Supplementary Angles
Angles that add up to 180 degrees
Complementary Angles
Angles that add up to 90 degrees
Quadrilateral
Any four sided shape. The interior angles add up to 360 degrees.
Irregular Quadrilateral
A four sided shape that doesn't have any special properties. The interior angles add up to 360 degrees.
Square
A four sided shape where all sides are equal in length and all angles are the same and equal 90 degrees
Rhombus
A four sided shape where all sides are equal in length. Opposite angles are equal in size.
Trapezium
A four sided shape where one pair of opposite sides is parallel
Parallelogram
A four sided shape where opposite sides are equal in length and opposite angles are equal in size
Rectangle
A four sided shape where opposite sides are equal in length. All angles are the same and equal 90 degrees.
Kite
A four sided shape with wo pairs of adjacent (next to each other) sides are equal in length. One pair of opposite angles (the ones that are between the sides of unequal length) are equal.
Pronumeral
A letter or a symbol that represents a number
Transversal
A line that intersects a pair of parallel lines
Vertex
A point where two or more straight lines, rays or line segments meet.
Angle
Is made when two lines meet at a point
Revolution ( or Perigon)
A revolution is equal to 360 degrees
Triangle
A three sided shape whose interior angles add up to 180 degrees
Acute Angled Triangle
A triangle that does not have an angle of 90 degrees or more. All three angles are acute.
Scalene Triangle
A triangle that does not have any sides that are equal in length
Equilateral Triangle
A triangle that has all sides equal in length
Right Angled Triangle
A triangle that has one angle of 90 degrees
Obtuse Angled Triangle
A triangle that has one angle of more than 90 degrees
Isosceles Triangle
A triangle that has two sides equal in length. The base angles of an isosceles triangle are also equal in size
Alternate Angles ( Z Angles)
Alternate angles are always equal
Straight Angle
An angle that is 180 degrees
Acute Angle
An angle that is < 90 degrees
Reflex Angle
An angle that is > 180 degrees and < 360 degrees
Obtuse Angle
An angle that is > 90 degrees and < 180 degrees
Right Angle
An angle that measures exactly 90 degrees
Protractor
The instrument used to measure angles
Cointerior Angles ( U Angles)
Cointerior angles always add up to 180 degrees
Corresponding Angles ( F Angles)
Corresponding angles are always equal
