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Please help me guys :)-example-1

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Answer:

9. Yes

10. No

11. No

12. Yes

Explanation:

To see if the following lengths make a right triangle, you have to apply the Pythagorean theorem to the triangle.

Which is a² + b² = c²

If the square of the length of the longest side of a triangle is equal to the sum of the squares of the other two sides, then the triangle is a right triangle.

9.

15² + 36² = 39²

225 + 1296 = 1521

1521 = 1521

So this is a right triangle

10.

6² + 8² = 9²

36 + 64 = 81

100 ≠ 81

So this is not a right triangle

11.

6.4² + 12² = 12.2²

40.96 + 144 = 148.84

184.96 ≠ 148.84

So this is not a right triangle

12.

2.1² + 7.2² = 7.5²

4.41 + 51.84 = 56.25

56.25 = 56.25

So this is a right triangle

User LazyTank
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