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WORTH 20 POINTS! Please help me :(

it says: Explain how you know that AB perp BC

WORTH 20 POINTS! Please help me :( it says: Explain how you know that AB perp BC-example-1
User Msp
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1 Answer

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Someone else should give a better answer but I think it’s because there is a dashed line in between and it looks like from A directly to C is equal to CD

If I’m not mistaken-
User Musaffa
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