Invertendo: if $\dfrac{a}{b} = \dfrac{c}{d}$, then

Invertendo: if $\dfrac{a}{b} = \dfrac{c}{d}$, then
  1. $\dfrac{b}{a} = \dfrac{d}{c}$
  2. $\dfrac{a}{c} = \dfrac{b}{d}$
  3. $\dfrac{a + b}{a - b} = \dfrac{c + d}{c - d}$
  4. $ab = cd$

Solution

Invertendo flips both ratios.

Asked in: MH-SSC-9

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