Geometry Formulas Flashcards
1
Q
Formula: area of a triangle
A
A = 1/2 (base)(height)
2
Q
What is the Pythagorean Theorem?
A
a2 + b2 = c2
3
Q
Special Right Triangle
45-45-90
A
45-45-90
X : X : X √2
4
Q
Special Right Triangle
30-60-90
A
30-60-90
X : X √3 : 2X
5
Q
Sum of all internal angles in any polygon?
A
180 (n – 2)
n is the number of sides
6
Q
Area of a circle
A
A = πr2
7
Q
One interior angle in a regular polygon
A
180 (n – 2) / n
n is the number of sides
8
Q
Circumference of a circle
A
C = 2 πr
9
Q
Area of a trapezoid
A
A = (a + b)/2 * h
10
Q
Circle formula
A
(x–a)2 + (y–b)2 = r2
Center is (a,b), radius > 0
11
Q
Volume of a cube
A
V = s3
12
Q
Area of a cube
A
A = 6s2
13
Q
Volume of a cylinder
A
V = πr2 h
14
Q
Surface area of a cylinder
A
2 π r2 + 2 πrh
