7th Grade Formulas

Area of a rectangle

A=​ (a)  

Area of a triangle:

A=​ (a)  

The radius of a circle is

• half the diameter

• double the diameter

• Twice the circumference

• Equal to the circumference

The diameter of a circle is

• twice the radius

• The circumference of the circle

• The area of the circle

• The radius of the circle

The formula for the surface area of a cylinder is...

• SA=2\pi h+2r

Percent Proportion Equation...

Percent equation...

When doing percent markup, to get the selling price, you must...

• add markup to original cost

• subtract markup from original cost

• multiply markup by original cost

• divide markup by original cost

When doing markdowns, to get the new sale price you would....

• subtract markdown from the regular price

• Add markdown to the regular price

• Multiply markdown by the regular price

• Divide markdown by the regular price