Need more detail to sovle
Equidistant
When a point is equal between two objects, this is know as a equidistant. In geometry, an equidistant is a locus between two points in a perpendicular bisector.
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Girls= 12+3b
boys=b
boys+girls=76
12+3b+b=76;
12+4b=76
-12 -12
4b=64
÷4. ÷4
b=16
I hopes this help!
Not sure what your question is asking. 9, 16, and 64 are perfect squares which show up a lot when using Pythagorean theorem, and are usually called "Pythagorean triplets" but they add up. Ex:

which is true, so (3, 4, 5) are a Pythagorean triplet.
Can you give more context to your question?