Question

The sub-duplicate ratio of $9:16$ is _____

• A. $3:4$
• B. $81:256$
• C. $4:3$
• D. $\sqrt{3}:\sqrt{4}$

Answer 1

The correct option is A $3:4$

The sub-duplicate ratio of $a:b$ is $\sqrt{a}:\sqrt{b}$.
$\therefore$ The subduplicate ratio of $9:16$ is $\sqrt{9}:\sqrt{16}=3:4$