1972 AHSME Problems/Problem 1

Let's test out the four triangles:

I: $3^2 + 4^2 = 5^2$ (true)

II: $4^2 + 7.5^2 = 8.5^2$ (true)

III: $7^2 + 24^2 = 25^2$

The only answer choice with I, II, and III in the answer is $\fbox{D} \rightarrow$ I, II, and III.

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