Penguins come in different sizes. Different species of penguins have quite different sizes.
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The side length is 70.71 cm
The length is 14 cm
According to Wikipedia: The largest living species is the Emperor Penguin (Aptenodytes forsteri): adults average about 1.1 m (3 ft 7 in) tall and weigh 35 kg (75 lb) or more. The smallest penguin species is the Little Blue Penguin (also known as the Fairy Penguin), which stands around 40 cm tall
The length of the diameter will be 30 cm if the radius is 15 cm.
Length = 24 cm and width = 12 cm Check: 2*(24+12) = 72 cm