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natka813 [3]
2 years ago
12

Find the value of x.

Mathematics
1 answer:
amm18122 years ago
7 0

Answer:

Step-by-step explanation:

By similar triangles (use the two smaller ones

7 / x = x / 3         Cross multiply

x^2 = 21              Take  the square root of both sides

√x^2 = √21

x = √21

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