Chapter 3: Measurement and Introduction into Pythagoras' Theorem Flashcards
What is perimeter?
The total distance around a closed shaped
Length conversions
Kilometre x 1000 = Metre Metre x 100 = Centimetre Centimetre x 10 = Millimetre Millimetre / 10 = Centimetre Centimetre / 100 = Metre Metre / 1000 = Kilometre
What is the diameter?
The distance across the centre of a circle
What is radius?
The distance from the centre of the circle to the outer edge
What is circumference?
The distance around a circle or perimeter of a circle
What is area?
A measure of surface
Converting metric units in area
Kilometre x 1000 = Metre Metre x 100 = Centimetre Centimetre x 10 = Millimetre Millimetre / 10 = Centimetre Centimetre / 100 = Metre Metre / 1000 = Kilometre NOTE THAT EACH OF THESE UNITS AND NUMBERS ARE SQUARED
What is a hectare?
10 000 metres squared
The perimeter of a circle
2 x Pi x radius
OR
Pi x diameter
The area of a circle
Pi x radius squared
The perimeter of a sector of a circle
The angle divided by 360 x 2 x Pi x radius
The area of a sector of a circle
The angle divided by 360 x Pi x radius squared
The perimeter of a square, rectangle, trapezium, parallelogram, rhombus, triangle and irregular shapes
Add all sides together
The area of a square
Length squared
The area of a rectangle
Length x width
