Maths Y09 Spr1 Flashcards
1.0 Degree
Unit of angle measurement. Symbol is °
1.1 Acute
Refers to an angle less than 90°
1.2 Right Angle
An angle of 90°. Corresponding to a quarter turn
1.3 Obtuse
An angle more than 90° but less than 180°
1.4 Straight Line
An angle of 180°. Corresponding to half a turn
1.5 Reflex
An angle greater than 180° and less than 360°
1.6 Full Turn (Circle)
Entire rotation is 360°. Corresponding to a full turn
1.7 Vertically opposite
Angles opposite each other when two lines cross – they are equal in size.
2 Parallel Lines
Two straight lines that never meet and stay the same distance away from each other throughout their entire length
2.1 Transversal
The third line which crosses the two parallel lines
2.2 Alternate
A pair of angles on the inner side of each of the parallel line and the transversal, but on opposite sides of the transversal are equal
2.3 Corresponding
The angles in matching corners made when the transversal crosses the two parallel lines corresponding angles are equal size
2.4 Co-Interior
Angles that lie between the two parallel lines on the same side of the transversal. The two angles sum to 180°
3.0 Polygon
A 2D shape having more than three straight sides
3.1 Regular Polygon
A polygon with all equal side lengths and all equal size interior and exterior angles
3.2 Interior Angle
Is an angle on the inside of the shape, made between two of the sides
3.3 Exterior Angle
Is an angle on the outside of the shape when the side lines are extended (360 ÷ n where n is the number of sizes)
3.4 Sum of interior Angles
(n – 2) x 180° where n is the number of sides
3.5 Individual Interior Angle
((n – 2) x 180°)/2 where n is the number of sides. Each individual interior angle is the same size
3.6 Sum of exterior Angle
All the exterior angles total 360°
3.01 3 Sides
Equilateral Triangle
3.02 4 Sides
Square
3.03 5 Sides
Pentagon
3.04 6 Sides
Hexagon
3.05 7 Sides
Heptagon
3.06 8 Sides
Octagon
3.07 9 Sides
Nonagon
3.08 10 Sides
Decagon
4.0 Net
A model of a solid shape opened up and flatten
4.1 Plan
A drawing of something as viewed from above
4.2 Elevation
The upwards angle from the horizontal to a line of sight from the observer of an object
4.3 Quadrilateral
A closed, two-dimensional shape which has four straight sides and four vertices
4.4 Square
Has four straight sides – all equal in length and has four right angles
4.5 Rectangle
A quadrilateral where all interior angles are right angles. Opposite sides are parallel and of equal length.
4.6 Rhombus
A quadrilateral with all sides equal in length. Also opposite sides are parallel and opposite angles are equal. The shapes diagonals bisect at right angle
4.7 Parallelogram
A quadrilateral whose opposite sides are parallel and equal in length. Opposite angles are equal.
4.8 Kite
A quadrilateral whose adjacent sides are of equal length. The kite’s diagonal bisect at right angle
5.0 Prism
A three-dimensional shape that has the same cross-sectional shape throughout. It’s two end faces are identical. A prism takes its name from the shape of its base
5.1 Face
A flat surface of a three-dimensional shape
5.2 Edge
The side of a polygon or a line segment where two faces meet
5.3 Vertex (Vertices)
The point where the edges of a solid meet. Vertices is the plural of a single vertex
5.4 Cube
Is a three-dimensional solid that has six identical square faces
5.5 Cuboid
Is a three-dimensional solid that has six rectangular faces. Cubes are a special type of cuboid
5.6 Cylinder
A circular prism.
5.7 Cone
Is a three-dimensional solid with a circular base and a curved surface that tapers to a point (vertex)
5.8 Pyramid
Is a three-dimensional solid which has a polygon base and triangular faces that taper to a point (vertex)
5.9 Sphere
Is a three-dimensional solid that is perfectly round, like a ball. Every point on the surface is the same distance from the centre
7.0
Sphere
7.1
Cube
7.2
Cuboid
7.3
Cylinder
7.4
Cone
7.5
Square Based Pyramid
7.6
Triangular Based Pyramid
7.7
Triangular Prism
6 Compass (Cardinal Points)
A navigational instrument that shows direction.
6.1 Bearing
The angle of direction in relation to a north line. Measured in degrees from the north in a clockwise direction. Given as a 3 digits
6.2 Clockwise
the same direction as the way hands on the clock go.
6.3 Reverse Bearing (back bearing)
The bearing of a line measured in direction backward to the direction of the original object. Back bearing is a line bearing ta`
6.4 Scale (in scale drawings)
the ratio of the measurement on the drawing compared to the measurement of the original subject.
7 Ratio
Ratio compares the size of one part to another part.
7.1 Proportion
Proportion compares the size of one part to the size of the whole. (Usually written as a fraction)