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