Add all three sides if they are given. If it is a right angled triangle you can also use Pythagoras’ theorem or trigonometry
No it is not the same as a rotation because when you reflect something you “mirror it” so basically it is the opposite and the side that was in the left is now on the right
Where as when you rotate about the origin the ordination changes but it doesn’t “flip” hope this helps
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i forgot but i did this earler
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math-way is a website where you can ask it math questions and it gives you the correct answer in seconds
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D
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because youe last number is 90