# More on Formulas

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So I believe that you have already done Intro to Forumla Chapter. If not, please do that first and then get back to this page. This is necessary to understand this chapter properly.

So this game discusses more after the intro. It starts by telling you that only like numbers can be added in Algebra and explains further for kids.

Here are a few formula examples:

1. The quadratic formula: x = (-b ± √(b² – 4ac)) / 2a. This formula is used to solve quadratic equations of the form ax² + bx + c = 0, where a, b, and c are constants.
2. The Pythagorean theorem: a² + b² = c². This formula is used to calculate the length of the sides of a right-angled triangle. Here, a and b are the lengths of the two shorter sides of the triangle, and c is the length of the hypotenuse (the longest side).
3. The formula for the circumference of a circle: C = 2πr. This formula is used to calculate the circumference (the distance around the edge) of a circle, where r is the radius (the distance from the center of the circle to the edge).
4. The formula for the area of a rectangle: A = lw. This formula is used to calculate the area (the amount of space inside) of a rectangle, where l is the length and w is the width.
5. The formula for simple interest: I = Prt. This formula is used to calculate the amount of interest earned on a principal (the amount of money invested), where P is the principal, r is the interest rate, and t is the time (in years).

These are just a few examples of the many formulas used in mathematics. Each formula has its own specific use and can be applied to solve different types of problems.

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