Know the ratio of circumference to diameter of any circle is always the same.
Circumference divided by diameter is pi 3.14
C= πd D= 2r
C= 2πr A= πr2
Area is the measure of space a two dimensional shape covers.
Sectors of circle graphs are made from central angles.
Negative numbers represent values below zero and positive numbers represents values above zero.
eg. above and below ground or sea level
1+(-2)= (-1) is an addition statement
3-(-1)= 4 is a subtraction statement
Opposite integers have the same numeral but different sign.
eg. 3 and (-3)
Know what a (+) + (+)= (+) - (+)=
(-) + (-)= (-) - (-)=
(+) + (-)= (+) - (-)=
(-) + (+)= (-) - (+)=
Practice with different numerals in each situation.
Good luck everyone!