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Juniorcesar
@Juniorcesar
April 2020
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Determine a area do triangulo abc cujos vertices sao 1(1 , 2) b (-2 , 8) e c (2 , 3 ).
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3478elc
Verified answer
1 2 1 1 2
D = -2 8 1 -2 8
2 3 1 2 3
D= 1.8.1+ 2.1.2 + 1.(-2).3 -[ 2.(-2)1+1.1.3 + 1.8.2]= 8+4-6 - [-4+3+16]
D= 6 -15 = 9
A = 1 . D
2
A = 1. 9 ==>
A = 9
2
2
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Verified answer
1 2 1 1 2D = -2 8 1 -2 8
2 3 1 2 3
D= 1.8.1+ 2.1.2 + 1.(-2).3 -[ 2.(-2)1+1.1.3 + 1.8.2]= 8+4-6 - [-4+3+16]
D= 6 -15 = 9
A = 1 . D
2
A = 1. 9 ==> A = 9
2 2