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Geometric proof of a trig identity on $\cos t \cos u\cos v$
geometry
trigonometry
alternative-proof
proof-without-words
Intuitive/Visual proof that $(1+2+\cdots+n)^2=1^3+2^3+\cdots+n^3$ [duplicate]
combinatorics
proof-without-words
Is there a sufficiently reachable plausibility argument that $\pi$ is irrational?
education
irrational-numbers
pi
proof-without-words
interactive-proofs
What is the explanation for this visual proof of the sum of squares?
summation
proof-explanation
visualization
proof-without-words
Geometric interpretation for sum of fourth powers
summation
proof-without-words
Visual proof of $\sum_{n=1}^\infty \frac{1}{n^4} = \frac{\pi^4}{90}$?
sequences-and-series
alternative-proof
visualization
proof-without-words
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