Respuesta :

ChoiSungHyun

Step-by-step explanation:

Since 9^2 + 12^2 = 15^2, it can form a right-angled triangle.

Since 2^6 + 6^2 = 40 and 40 ≠ (√38)^2, it cannot form a right-angled triangle.

Since 3^2 + 9^2 = 90 and 90 ≠ (√91)^2, it cannot form a right-angled triangle.

So the only answer is A.

MasarShakir

Answer:

A

Step-by-step explanation:

You do pythagorean theorem on each one. I did this first one and luckily got it right. 9 squared is 81. 12 squared is 144 and 15 squared is 225. Since 15 is the biggest side, it is the hypotenuse. So you add 81 and 144 to equal 225. The first one is in fact a right triangle.

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