正弦定理

law of sines

first month of the lunar year

straight / upright / proper / main / principal / to correct / to rectify / exactly / just (at that time) / right (in that place) / (math.) positive

(math.) sine

bow string / string of musical instrument / watchspring / chord (segment of curve) / hypotenuse / CL:根[gen1]

to set / to fix / to determine / to decide / to order

established theory / theorem (math.)

theorem

texture / grain (of wood) / inner essence / intrinsic order / reason / logic / truth / science / natural science (esp. physics) / to manage / to pay attention to / to run (affairs) / to handle / to put in order / to tidy up