And “a^2” means “a” in product with itself twice. 2a means that “a” is multiplied by 2 or twice and a^2 means that “a” is multiplied by itself once to become square of itself as “a×a”.
What is A2 equal to?
The A2 size print measures 42.0 x 59.4cm, 16.53 x 23.39 inches, if mounted 59.4 x 76.6cm, 23.39 x 30.16 inches. The A3 size print measures 29.7 x 42.0cm, 11.69 x 16.53 inches, if mounted 40.6 x 50.8cm, 15.98 x 20 inches.