bonjour
1 ) diagonale ² = 20 ² + 20 ² = 800
diagonale = √800 = 28.28 cm
2) CB² = ( √3)² + 3 ² = 3 + 9 = 12
CB = √12
FD² = ( √5 - 1 )² + (√5 + 1 )² = 5 - 2 √5 + 1 + 5 + 2 √5 + 1 = 12
3 ) a² = [√3 ( 1 + √6 ) ]²
a² = ( √3 + √18)² = 3 + 2 √54 + 18 = 21 + 12 √6
b ² = ( ( 3 - √6)² = 9 - 6 √6 + 6 = 15 - 6 √6
h = 21 + 12 √6 + 15 - 6 √6 = 36 + 6 √6
voilà continue, j'en ai fait 3
