Geometry Flashcards
1
Q
Postulate
A
Truths accepted without proof
2
Q
Theorem
A
Must be proven before it can be used
3
Q
Axiom
A
Truth accepted without formal proof
4
Q
Addition property of equality
A
If a=b then a+c=b+c
5
Q
Subtraction property of equality
A
If a=b then a-c=b-c
6
Q
Multiplication property of equality
A
If a=b then ac=bc
7
Q
Division property of equality
A
If a=b then a/c=b/c
8
Q
Reflexive property of equality
A
a=a
9
Q
Symmetric property of equality
A
If a=b then b=a
10
Q
Transitive property of equality
A
If a=b and b=c then a=c
11
Q
Substitution property of equality
A
If a=b then b can be substituted for a in any expression
12
Q
Skew lines
A
Not parallel; do not intersect; not coplanar
13
Q
Sum of interior angles
A
(n-2)*180
14
Q
Angle of regular polygon
A
(n-2)*180/n
15
Q
Lateral edge square pyramid
A
square root of h^2+1/2a^2
h=height
a=base length
