The side lengths of three triangles are shown. Which of the triangles are right triangles?
Triangle
1
2
Side Lengths
20 V425 5
14 21 10
6 8 10
3
11
11
11
Select all that apply.
Triangle 2
Triangle 3
Triangle 1

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Step-by-step explanation:

step-by-step explan mxfcg'k; uafwgzfgjhklhgation:

see explanation

step-by-step explanation:

a

(6r + 7) + (13 + 7r) ( remove brackets and collect like terms )

= 6r + 7 + 13 + 7r

= 13r + 20

b

remove brackets and collect like terms

13 - r - 1 + r

= 12 - r

c

remove brackets and collect like terms

= - 8 - r + 2r - 4

= - 12 + r

d

remove brackets and collect like terms

= 7r - - - 6r

[-   - = - - = - ]

= r -