*7th Grade Properties and Formulas*

__Angle and Side Properties: draw a sample picture to help you remember!__

· triangle = 180 degrees

· quadrilateral = 360 degrees

(lines will touch one another eventually)

· parallelograms: opposite sides

are parallel and congruent

· rectangles: 90 degree angles and

opposite sides are congruent

· rhombi: all sides same length,

opposite angles are congruent

· squares: angles are 90 degrees,

all sides congruent

· trapezoids: (very similar to a quadrilateral)

one pair of opposite sides are parallel the other pair is NOT

__1. PERIMETER: add up all sides or 2l + 2w__

**Formulas**2. AREA: l x w (answer is always squared)

3. CIRCUMFERENCE OF CIRCLE:

~d (if give diameter)

2~r (if give radius)

4. AREA OF PARALLELOGRAM: A=bh

5. AREA OF TRIANGLE: A=1/2bh

6. area of Trapezoid: A=1/2h(b + B)

7. area of circle: A= ~

8. area of semicircle: A=

area is always : squared

volume is always : cubed

PEMDAS: Parenthesis, exponents, multiplication and division, addition and subtraction