Select all the sets of side lengths that will make a triangular shelf fit in a 90° corner of a room.

6 cm, 8 cm, 10 cm

2 cm, 3 cm, 4 cm

5 cm, 6 cm, 9 cm

3 cm, 4 cm, 5 cm

7 cm, 9 cm, 11 cm

Formula to see if perfect right angle: A ² + B ² = C ²

1. 36 + 64 = 10 ² (100) YES

2. 4 + 9 = 4 ² (16) NO

3. 25 + 36 = 9 ² (81) NO

4. 9 + 16 = 5 ² (25) YES

5. 49 + 81 = 121 NO

The answers are:

1. 6cm, 8cm, 10cm

and

4. 7cm, 9cm, 11cm