Calculer AT et AS
DT = DA + AT ⇒ AT = DT - DA = 8.5 - 6 = 2.5 cm
⇒ AT = 2.5 cm
(CD) // (AB) et S ∈ (AB) ⇒ (CD) // (AS) ⇒ on applique le théorème de Thalès
TA/TD = AS/DC ⇒ AS = TA x DC/TD = 2.5 x 6/8.5 = =1.7647 cm ≈ 1.8 cm
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Calculer AT et AS
DT = DA + AT ⇒ AT = DT - DA = 8.5 - 6 = 2.5 cm
⇒ AT = 2.5 cm
(CD) // (AB) et S ∈ (AB) ⇒ (CD) // (AS) ⇒ on applique le théorème de Thalès
TA/TD = AS/DC ⇒ AS = TA x DC/TD = 2.5 x 6/8.5 = =1.7647 cm ≈ 1.8 cm