Trapezoid area
((a+b)/2)*h
Basically, the 2 bases added, divided by 2, and that quotient is multiplied by the height.
Circle area
Pie R Squared
Circle diameter
2 R
Circle circumference
Pie Diameter
What does it mean if something is expressed as “y in terms of x”?
Read it from left to right - y is isolated on the left side and on the other side is the x.