a)
Dans la triangle rectangle BCD
tanC = BD/CD (côté opposé/ côté adjacent)
tan4,3° = BD/ 29
BD = 29 x tan4,3°
BD = 2,18 km (arrondi de 2,18052....)
b)
CD = 20% AB
29 = (20/100)AB
AB = (29 x 100)/20
AB = 29 x 5
AB = 145 (km)
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a)
Dans la triangle rectangle BCD
tanC = BD/CD (côté opposé/ côté adjacent)
tan4,3° = BD/ 29
BD = 29 x tan4,3°
BD = 2,18 km (arrondi de 2,18052....)
b)
CD = 20% AB
29 = (20/100)AB
AB = (29 x 100)/20
AB = 29 x 5
AB = 145 (km)