Math A Formula Sheet
Area and Perimeter Formulas
Volume and Surface Area
Perimeter = distance around the
outside (add all sides).
Trigonometric Formulas
Right Triangle Formulas
Coordinate Geometry Formulas
Distance Formula:
Midpoint Formula:
Slope Formula:
Triples: 3,4,5
5,12,13
8,15,17
Parallel lines have equal slope.
Perpendicular lines have negative
reciprocal slopes.
Equations of Circles
and Parabolas
Equations of Lines
Circle, center at origin:
Slope-Intercept Method:
Circle, center at (h,k):
Point-Slope Method:
Parabola:
Angle Information
Complementary angles - two angles
whose sum is 90.
Supplementary angles - two angles
whose sum is 180.
Parallel Lines
General Triangle Info
Sum of angles of triangle = 180.
Measure of exterior angle of triangle
= the sum of the two non-adjacent
interior angles.
The sum of any two sides of a
triangle is greater than the third side.
Polygons
Sum of Interior Angles:
Sum of Exterior Angles:
Corresponding angles are equal.
<1=<5, <2=<6, <3=<7, <4=<8
Each Interior Angle (regular poly):
Alternate Interior angles are equal.
<3=<6, <4=<5
Alternate Exterior angles are equal.
<1=<8, <2=<7
Same side interior angles are
supplementary.
m<3+m<5=180, m<4+m<6=180
Each Exterior Angle (regular poly):
Probability
Probabilities are never greater than 1 or
less than 0.
Similar Triangles
Two triangles are similar if the
corresponding angles are congruent
and the corresponding sides are in
proportion.
Complement:
P(A and B) = P(A)•P(B)
For AND, multiply individual
probabilities. Check for replacement.
P(A or B) = P(A)+P(B)-P(A and B)
For OR, add the individual probabilities
and subtract the overlap.
Factorial:
n! = n(n-1)(n-2)(n-3)...1
Additional method of solution: A line
parallel to one side of a triangle divides
the non-parallel sides proportionally.