Tusi couple #geometry

arctan 1 + arctan 2 + arctan 3 = π

#pi #geometry

a³-b³=(a-b) (a²+ab+b²)
#geometry

Surface area of sphere
#geometry #integrals

Hashtags List:
#angles
#anglesum
#basics
#byparts
#calculus
#catalannumbers
#circle
#complex
#continuity
#cos
#determinant
#derivative
#discrete
#distribution
#divisibilityrules
#epsilondelta
#eulersidentity
#factorial
#fft
#fibonacci
#function
#geometry
#goldenratio
#GramSchmidt
#graphtheory
#history
#hyperbolic
#inf
#integrals
#jensensinequality
#latex
#limits
#linearalgebra
#log
#Lpspace
#matrix
#maximal
#minimal
#parabola
#paradox
#pascalstheorem
#pascalstriangle
#pi
#primenumbers
#pythagorastheorem
#pythagoreanidentities
#quotientgroup
#rational
#realnumbers
#ruleandcompass
#sets
#series
#sin
#statistics
#stochastic
#sup
#tan
#taylorpolynomial
#topology
#torus
#trigonometricidentities

#geometry #angles #sin #cos

In #geometry of tessellations, a rep-tile or reptile is a shape that can be dissected into smaller copies of the same shape.
In the example, defining an aperiodic tiling (the pinwheel tiling) by repeatedly dissecting and inflating a rep-tile.

#geometry #cos

the geometric mean of two positive numbers is less than or equal to their arithmetic mean #geometry

#geometry #angles

#pythagorastheorem #geometry

#pythagorastheorem #geometry