Fig a :
P = 4c
P = 4×11
P = 44 m
A = c²
A = 11²
A = 121 m²
Fig b :
P = 2L + 2l
P = 2×15 + 2×6
P = 42 cm
A = L × l
A = 15 × 6
A = 90 cm²
Fig c :
P = 2∏r
P = 2∏ × 7
P = 14∏ ≈ 44 m
A = ∏ × r²
A = ∏ × 7²
A = 49 ∏ ≈ 154 m²
Fig d :
P = opposé + adjacent + hypoténus
P = 6 + 8 + 10
P = 24 m
A= base × hauteur /2
A= 8 × 9 /2
A= 36 m²
