Year 7 Maths:- Angles

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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


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