(geometry, functional analysis) the Pythagorean theorem

ピタゴラスの定理: the Pythagorean theorem

Pythagoras (Ancient Greek mathematician and philosopher)

untie; unravel; undo (a fastening); unwrap / dispel (doubts); clear up (a matter)

solve (a problem); answer (a question); unravel (a riddle) / comb; untangle (hair)

theorem / (sciences) principle; rule

to use / to employ / to make use of, to apply / to spend

mathematics (field of study)

question, problem on homework etc. / a question; a matter (of time etc.) / a problem (something that needs to be dealt with); a trouble / an issue; a matter

(calculus) Green's theorem