27 April 2021 Sergiu Funieru Perimeter of the scalene triangle (formula and example) +1 +1 Continue reading
25 April 2021 Sergiu Funieru Perimeter of the equilateral triangle (formula and example) +1 +1 Continue reading
19 April 2021 Sergiu Funieru sin 3a (formula and example) (sine of triple angle) (trigonometry) (handwritten) +1 +1 Continue reading
