Question

What is Invertendo ? Please explain.

Answer 1

By using invertendo in fractions of form

$\frac{a}{b} = \frac{c}{d}$
we get
$\frac{a}{c} = \frac{b}{d}$

Answer 2

In Invertendo, if a : b = c : d then b : a = d : c. In this law, you need to remember that if the ratio is in proportion then the inverse of that ratio is also proportion to each other.

For, example 8 : 10 = 16 : 25.

Here using the Invertendo law, 10 : 8 = 25 : 16 => 5 : 4 = 5 : 4.