What is a sigma??? pls need help!!

The greek letter sigma has many meanings and uses in math.

The uppercase form is written as which looks like a fancy or weird looking letter "E". This form indicates we'll be adding a bunch of items. They can be numbers or algebraic expressions.

The lowercase form is written as which looks like a rotated letter "b" in a way. This lowercase form is often used for population standard deviations in statistics.

There are many other uses for this greek letter, so you'll need to provide more context and information to the question.

The side of the playground is around 10 meters long

Step-by-step explanation:

use the diagonal as the hypotenuse of a right triangle, where the sides of the square form the legs of said triangle.

Usually

since we know a and b are the same length (sides of a square are congruent) we would have

We know that c is 14 so