Trigonometry/
Ratnasiri, G.L.
Trigonometry/ - Nawala: OUSL, 2022. - 95p.
Orthogonal projection, pythagorean relationship
515 / RAT
Trigonometry/ - Nawala: OUSL, 2022. - 95p.
Orthogonal projection, pythagorean relationship
515 / RAT
