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Need help with math

Need help with math-example-1
User IceWhisper
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2 Answers

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So you use the idea of similar triangles. The ratio of the sides for big triangle:little triangle is 20:5 (simplified to 4:1). To find x, you use this ratio - 52/4 = 13 so x=13
User Saalon
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The answer is 13 btw.
User Matthias Burger
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