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141.
Isoscales triangle height
$h^2=b^2-\dfrac{a^2}{4}$
Height
Side
Triangle
142.
Isoscales triangle leg
$b^2=h^2+\dfrac{a^2}{4}$
Side
Triangle
143.
Isoscales triangle base
$a^2=4b^2-4h^2$
Side
Triangle
144.
Isoscales triangle perimeter
$P=a+2b$
Perimeter
Side
Triangle
145.
Isoscales triangle area
$A=\dfrac{ah}{2}$
Area
Height
Side
Triangle
146.
Isoscales triangle area
$A=\dfrac{b^2}{2}\sin\alpha$
Area
Side
Triangle
147.
Diagonal of a square
$d=a\sqrt{2}$
Diagonal
Square
148.
Circumscribed radius of a square
$R=\dfrac{d}{2}$
Circumcircle R
Square
149.
Circumscribed radius of a square
$R=\dfrac{a\sqrt{2}}{2}$
Circumcircle R
Square
150.
Incircle radius of a square
$r=\dfrac{a}{2}$
Incircle r
Square
151.
Perimeter of a square
$P=4a$
Perimeter
Square
152.
Area of a square
$A = a^2$
Area
Square
153.
Rectangle diagonal
$d=\sqrt{a^2+b^2}$
Diagonal
Rectangle
154.
Rectangle circumcircle radius
$R=\dfrac{d}{2}$
Circumcircle R
Rectangle
155.
Rectangle perimeter
$P=2a+ab$
Perimeter
Rectangle
156.
Rectangle area
$A=ab$
Area
Rectangle
157.
Sum of angles in parallelogram
$\alpha + \beta = 180\degree$
Parallelogram
Angle
158.
$d_1^2+d_2^2=2\left(a^2+b^2\right)$
Parallelogram
159.
Height of a parallelogram
$h=b\sin\alpha$
Height
Parallelogram
160.
Height of a parallelogram
$h=a\sin\beta$
Height
Parallelogram

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