Bonjour,
aire figure = aire carré + aire demi-cercle
on a aire carré = c² = 70² = 4 900 cm²
aire demi-cercle = (π × r²)/2
on a d = 70 donc r = 70/2 = 35
donc aire demi cercle = (π × 35²)/2 ≈ 1 924 cm²
donc aire figure = 4 900 cm² + 1 924 cm² = 6 824 cm²
