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121.
identity
$A \cup \empty = A$
Sets
122.
Identity
$A \cap I = A$
Sets
123.
Complement
$A^\prime=\{x \in I : x \notin A\}$
Sets
124.
Complement of union
$A \cup A^\prime = I$
Sets
125.
Complement of intersection
$A \cap A^\prime=\empty$
Sets
126.
De morgan's law
$\left(A \cup B\right)^\prime=A^\prime \cap B^\prime$
Sets
127.
De morgan's law
$\left(A \cap B\right)^\prime=A^\prime \cup B^\prime$
Sets
128.
$B \setminus A = B \setminus \left(A \cap B\right)$
Sets
129.
$B \setminus A^\prime = B \cap A^\prime$
Sets
130.
$A \setminus A = \empty$
Sets
131.
$\left(A \setminus B\right) \cap C = \left(A \cap B \right) \setminus \left(B \cap C \right)$
Sets
132.
Circumscribed radius of equilateral triangle
$R=\dfrac{2h}{3}$
Circumcircle R
Triangle
133.
Circumscribed radius of equilateral triangle
$R=\dfrac{a\sqrt{3}}{3}$
Circumcircle R
Triangle
134.
Incircle radius of equilateral triangle
$r=\dfrac{h}{3}$
Incircle r
Triangle
135.
Incircle radius of equilateral triangle
$r=\dfrac{a\sqrt{3}}{6}$
Incircle r
Triangle
136.
Incircle radius of equilateral triangle
$r=\dfrac{R}{2}$
Incircle r
Triangle
137.
Equilateral triangle perimeter
$P=3a$
Perimeter
Triangle
138.
Equilateral triangle area
$A=\dfrac{ah}{2}$
Area
Triangle
139.
Equilateral triangle area
$A=\dfrac{a^2\sqrt3}{4}$
Area
Side
Triangle
140.
Isoscales triangle - base angle
$\beta = 90\degree-\dfrac{\alpha}{2}$
Triangle
Angle

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