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bija089 [108]
3 years ago
5

I put this but idk how to do it

Mathematics
1 answer:
Inessa05 [86]3 years ago
3 0
D ( AC ) = 6  ( because A and C have the same y-coordinate )
d ( AB ) = √[(x2 - x1)² + (y2 - y1)²],  
where A ( x1, y1 ) = ( -3, 1 )   and B ( x2, y2 ) = ( -1, 3 )
d ( AB ) = √[(-1 -(-3))² + (3 - 1 )²] = √[(-2)² + 2²] = √8 = 2√2
d ( BC ) = √[(3-(-1))² + (1-3)² =√[4² + (-2)²]= √20 = 2√5
The perimeter of ΔABC:
6 + 2√2 + 2√5 = 6 + 2 · 1.41 + 2 · 2.24 = 
= 6 + 2.82 + 4.48 = 13.30
 
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