Please help bra

1, yes it is a right angle. 2, yes it is a right angle.3, yes it is a right angle.

Step-by-step explanation:

1.Using the Pythagorean Theorem: 5 * 5 = 25, 12 * 12 = 144, 13 * 13 = 169, so 25 + 144 = 169 so yes it is a right angle.

2. Using the Pythagorean Theorem: 6 * 6 = 36, 8 * 8 = 64, 10 * 10 = 100, so 36 + 64 = 100, so yes it is a right angle.

3. Using the Pythagorean Theorem: 8 * 8 = 64, 15* 15 = 225, 17 * 17 = 289, so 64 + 225 = 289, so yes it is a right angle.

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step-by-step explanation:

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but which class are u may know that first