Dimensions that maximize the area of the rectangle (KristaKingMath)

From a channel Lumen includes in full: Krista King teaches high-school and college maths (algebra, calculus, linear algebra, statistics) with clear, short, worked-example lessons organised by course.

A 6-minute video from Krista King's catalogue; the title names its topic.

Video by Krista King, played through YouTube's embedded player.