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What is the value of x in the triangle?

What is the value of x in the triangle?-example-1

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Hello!

Pythagore!

so:

x² = 10² + 10²

x² = 100 + 100

x² = 200

x = √200

x = √(2*100)

x = √2 * √100

x = √2 * 10

x = 10√2

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