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After you find what C squared equals, you will need to square root it to find the missing length.

Standard index form is also known as standard form. It is very useful when writing very big or very small numbers. In standard form, a number is always written as: A × 10 n A is always between 1 and 10. n tells us how many places to move the decimal point.

The triangle will show the lengths of different sides. Different sides mean different formulas. Opposite/Hypotenuse = Sin Adjacent/Hypotenuse = Cos Opposite/Adjacent = Tan You will find the three formulae on a scientific calculator.

Example: Write 15 000 000 in standard index form. Solution: 15 000 000 = 1.5 × 10 000 000 This can be rewritten as: 1.5 × 10 × 10 × 10 × 10 × 10 × 10 × 10 = 1. 5 × 10 7