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Sagot :

Réponse :

1:  3/4 de cercle

A = (pi*2²)*3/4 = 4pi*3/4 = 12pi/4 = 3pi (cm²)≈9,42477cm²

2) demi-cercle + carré

A = (pi*1,5)²/2+3² = 1,125pi+9≈3,5342+9≈12,5342cm²

3) cercle

A = pi*r² = pi*1²≈3,14159cm²

Explications étape par étape :

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