Réponse :
bonjour
Explications étape par étape
1)AS
a) triangle rectangle ARS
AS²=AR²+RS²
AS²=2.1²+2.8²
AS²=4.41+7.84
AS²=12.25
AS=3.5
2)
triangle ABC
RS//BC
AR/AB=AS/AC=RS/BC
AB=2.1+3.9
AB=6
2.1/6= 3.5/AC
6*3.5=2.1 AC
21=2.1AC
21/2.1=AC
AC=10
2.8/BC=2.1/6
2.1BC=6*2.8
2.1BC=16.8
BC=8
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Réponse :
bonjour
Explications étape par étape
1)AS
a) triangle rectangle ARS
AS²=AR²+RS²
AS²=2.1²+2.8²
AS²=4.41+7.84
AS²=12.25
AS=3.5
2)
triangle ABC
RS//BC
AR/AB=AS/AC=RS/BC
AB=2.1+3.9
AB=6
2.1/6= 3.5/AC
6*3.5=2.1 AC
21=2.1AC
21/2.1=AC
AC=10
2.8/BC=2.1/6
2.1BC=6*2.8
2.1BC=16.8
BC=8