The side lengths of different triangles are given. which triangle is a right triangle?

Since right triangles all follow the Pythagorean Theorem (a^2 + b^2 = c^2), you would use the Pythagorean Theorem to figure this out:

A). 6^2 + 7^2 =? 13^2

36 + 49 =? 169

85 is not equal to 169.

B). (sqrt (21))^2 + (sqrt (99))^2 =? 11^2

21 + 99 =? 121

120 is not equal to 121.

C). 10^2 + 60^2 =? 61^2

100 + 3600 =? 3721

3700 is not equal to 3721.

D). (sqrt (35))^2 + (sqrt (14))^2 =? 7^2

35 + 14 =? 49

49 is equal to 49.

The answer is (D).

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