Ответ:

64° = 16π/45

3π/5 = 108°

Вроде так)

Verified answer

градус  = радиан * 180 / π
радиан = градус  * π / 180
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64 ° = 64 * π / 180 = 16π / 45 ≈ π / 3
3π/5 = 3π/5 * 180/π = 540/5 = 108°