Radius

Half the diameter of a circle.

Diameter

2 radi that passes through center of a circle

Sector

A section of a circle that is made up of 2 radi and an arc joining them

How to make a perpendicular bisector

1. open the compass to just over half way of the line segment

2. sharp the point at point A and make an arc

3. sharp the point at point B and  make an arc

4. with a ruler join the 2 intersections of the arcs

Circumference

The area around the circle.

watch this video to learn more about constants

Constant

A number that does not change and it increases or decreases the value of an expression.

Click here to watch a video about variables

Value

a known or calculated amount

Variable

a letter that represents an unknown number.

Eg, x, a, n

watch this video to learn more about divisibility rules

Divisibility Rule For 5 Video:

Divisibility rule for 5

All numbers ending in 0 or 5
eg: 5, 10, 15, 20, 25, 30, 35, 40

Order of Operations

Order of Operations

check this video: Order of Operations