Maths Yr09 Sum1 Flashcards
1 Distance-Time Graphs
You can find the speed from the gradient of the line (Distance ÷ Time)
1.1 Real Life Graphs
Graphs that model a real-life situation
1.2 Pythagoras’ theorem
For any right angled triangle:
1.3 Hypotenuse
The longest side of a right-angled triangle. It is always opposite the right angle. For Pythagoras’ theorem, this is represented by ‘c’. For trigonometry we label it ‘H’
1.4 Adjacent
The side next to the angle.
1.5 Opposite
The side opposite the given or asked for angle.
1.6 Trigonometric Formulae
Use SOH CAH TOA to remember the formula:
1.7 Acute angle
An angle less than 90°
1.8 Right angle
An angle of 90°
1.9 Obtuse angle
An angle between 90° and 180°
2 Reflex angle
An angle greater than 180° but less than 360°
2.1 Angles on a straight line
Angles on a straight line sum to 180°
2.2 Angles in a triangle
Angles in a triangle sum to 180°
2.3 Angles around a point
Angles around a point sum to 360°
2.4 Parallel lines
Two lines that are always the same distance apart (equidistant)
2.5 Alternate angles
Alternate angles are equal. (‘Z’ shape)
2.6 Corresponding angles
Corresponding angles are equal. (‘F’ shape)
2.7 Co-interior angles
Co-interior angles sum to 180 (‘C’ shape)
2.8 Vertically opposite
Vertically opposite angles are equal
2.9 Bearing
An angle, measured clockwise from north line, has 3 digits.
3 Perimeter
The total distance around the outside of a shape
3.1 Area
The amount of space inside a shape.
3.2 Area of a Rectangle
Length x Width
3.3 Area of a Parallelogram
Base x Perpendicular Height
Not the slant height.
3.4 Area of a Triangle
Base x Height ÷ 2