Chap 11 - Pythagoras, Similarity, Congruency Flashcards
1
Q
formula for Pythagoras
A
-a^2 + b^2 = c^2
-only in right angel
2
Q
define similar
A
-same angles = in ratio to each other
3
Q
define congruent
A
-same angles and sides = identical
4
Q
note: put same dimensions in ratio
1D/ 1D, 2D/ 2D, 3D/ 3D
A
5
Q
how to change ratio of 1D to 2D / 3D
A
-2D = ^2
-3D = ^3
6
Q
how to change 2D / 3D to 1D
A
-2D = √
-3D = ∛
7
Q
how to change 2D / 3D to 2D / 3D
A
-change one side to 1D then to the same D
8
Q
congruency tests
A
(S = side, A = angle)
-SAS
-ASA
-SSS
-AAA
-RHS = Right angle, hypotenuse, S
9
Q
What is 1D, 2D, 3D
A
-1D = length
-2D = area
-3D = volume
10
Q
what happens to area of length is x2 / x3
A
-x2 = x4 area
-x3 = x9 area
11
Q
how to write congruency statement
A
- (shape) ≅ (shape)
