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the claim

All angles of an isosceles triangle are equal.

the verdict
REFUTED
the evidence says no
Recorded sources
0 sources for · 4 against

Counts group repeated records of the same source within each side. They do not measure evidence strength or source independence.

Is it true that all angles of an isosceles triangle are equal?

No. Reference and textbook sources describe an isosceles triangle as having two equal base angles (the vertex angle distinct), which contradicts the claim that all angles are equal. Only the equilateral special case has all three angles equal.

Verdict: REFUTED · 0 sources for, 4 against · Last checked

The private library was unavailable for some searches in this check. Missing library results are not evidence against the claim.

Evidence against · 4
Isosceles triangle
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Isosceles triangle. (n.d.). en.wikipedia.org. https://en.wikipedia.org/wiki/Isosceles_triangle

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More against · 3
Proving the Equkaity of the Base Angles of an Isosceles Triangle
1929
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Nyberg, J. A. (1929). Proving the Equkaity of the Base Angles of an Isosceles Triangle. doi.org. https://doi.org/10.5951/mt.22.6.0318

ERIC EJ769986: Teaching Square Roots: Conceptual Complexity in Mathematics Language
2007
Get citation
ERIC (2007). ERIC EJ769986: Teaching Square Roots: Conceptual Complexity in Mathematics Language. archive.org. https://archive.org/details/ERIC_EJ769986

PROPERLY MIXED. (Evening Post, 31 May 1924)
1924
Get citation
PROPERLY MIXED. (Evening Post, 31 May 1924). (1924). paperspast.natlib.govt.nz. https://paperspast.natlib.govt.nz/newspapers/EP19240531.2.162.4

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