According to the energy-momentum relation, the square of the four-momentum equals the square of the mass, and because all the photons are moving in the same direction.

The square of 1, i.e. 1 multiplied by 1, equals 1.

In either case, it states that the square of the hypotenuse equals the sum of the squares of the sides.

The square on the hypotenuse equals the sum of the squares on the other two sides.

"The square of the hypotenuse," said Tina, her voice full of wonder, "equals the sum of the squares of the other two sides."

Draw lines representing these measurements on the graph paper, to a scale in which one square on the paper equals a constant number of inches.

Pythagoras' theorem: In a right-angled triangle, the square of the hypotenuse equals the sum of the squares of the other two sides.

In the periodic table, one square equals one element.

In a supercommutative algebra (away from 2), the square of any odd element equals to zero.

The square of the length of a cathetus equals the product of the lengths of its orthographic projection on the hypotenuse times the length of this.