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Do you remember the Pythagorean Theorem?

One of the most important theorems in mathematics is called the Pythagorean Theorem. You have used it before and you will use it again in this lesson. Let's review the theorem so that you are ready for this lesson.

Remember that the Pythagorean Theorem only works for right triangles. Click on the image of a right triangle below to learn more about the theorem. 

Right Triangle

Click here to begin.

Suppose you have a right triangle with two legs measuring 3 cm and 4 cm. What is the length of the hypotenuse?

Use the Pythagorean Theorem to solve this problem:
\(\small\mathsf{ a^{2}+b^{2}=c^{2} }\)
\(\small\mathsf{ 3^{2}+4^{2}=c^{2} }\)
\(\small\mathsf{ 9+16=c^{2} }\)
\(\small\mathsf{ 25=c^{2} }\)
c = 5 cm

triangle

Find the missing hypotenuse of the right triangle above. Round your answer to two decimal places.

Use the Pythagorean Theorem to solve the problem.
\(\small\mathsf{ a^{2}+b^{2}=c^{2} }\)
\(\small\mathsf{6^{2}+3^{2}=c^{2} }\)
\(\small\mathsf{36+9=c^{2} }\)
\(\small\mathsf{45=c^{2} }\)
c\(\mathsf{\approx {} }\)6.71

triangle

Find the missing side of the right triangle above. Round your answer to two decimal places.

Use the Pythagorean Theorem to solve the problem.
\(\small\mathsf{ a^{2}+b^{2}=c^{2} }\)
\(\small\mathsf{ a^{2}+5^{2}=7^{2}}\)
\(\small\mathsf{ a^{2}+25=49}\)
\(\small\mathsf{a^{2}=24}\)
a \(\mathsf{\approx {} }\)4.90

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