Bonjour,
Ex 1 :
Figure en PJ
Calcul de DE: utiliser le th de Thalès, on a:
DE/DS= EF/ST
DE/6.3= 2.9/8.7
8.7 DE= 6.3 x 2.9
DE= 18.27/8.7
DE= 2.1 cm
Calcul de DT: th de Thalès:
DF/DT= EF/ST
1.8/DT= 2.9/8.7
2.9 DT= 1.8 x 8.7
DT= 15.66/2.9
DT= 5.4 cm
Ex 2 :
fig a:
Calcul de MT:
AT/AH= MT/SH
3/(3+7)= MT/17.5
10 MT= 3 x 17.5
MT= 52.5/10
MT= 5.25
fig b:
Calcul de OC:
OC/SC= RC/CK
OC/10.5= 3/7
7 OC= 10.5 x 3
OC= 31.5/7
OC= 4.5
fig c:
Calcul de OK:
OC/CK= OH/IK
2/(2+z)= 3/9
3(2+z)= 2 x 9
6+3z= 18
3z= 18-6
z= 12/3
z= 4
donc OK= 4
Copyright © 2024 ELIBRARY.TIPS - All rights reserved.
Lista de comentários
Bonjour,
Ex 1 :
Figure en PJ
Calcul de DE: utiliser le th de Thalès, on a:
DE/DS= EF/ST
DE/6.3= 2.9/8.7
8.7 DE= 6.3 x 2.9
DE= 18.27/8.7
DE= 2.1 cm
Calcul de DT: th de Thalès:
DF/DT= EF/ST
1.8/DT= 2.9/8.7
2.9 DT= 1.8 x 8.7
DT= 15.66/2.9
DT= 5.4 cm
Ex 2 :
fig a:
Calcul de MT:
AT/AH= MT/SH
3/(3+7)= MT/17.5
10 MT= 3 x 17.5
MT= 52.5/10
MT= 5.25
fig b:
Calcul de OC:
OC/SC= RC/CK
OC/10.5= 3/7
7 OC= 10.5 x 3
OC= 31.5/7
OC= 4.5
fig c:
Calcul de OK:
OC/CK= OH/IK
2/(2+z)= 3/9
3(2+z)= 2 x 9
6+3z= 18
3z= 18-6
z= 12/3
z= 4
donc OK= 4