Question

pls . dau Coroana ..... plsssssssss​

Answer 1

Răspuns:

Explicație pas cu pas:

Patrat

L = 35 cm

P = 4 x L = 4 x 35 = 140 cm

A = L x L = 35 x 35 = 1225 cm^2

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P = 444 cm

L = P : 4 = 444 : 4 = 111 cm

A = L x L = 111 x 111 = 12321 cm^2

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A = 16 cm^2

L = 4 cm

P = 4 x L = 4 x 4 = 16 cm

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celelalte 3 cazuri sunt la fel ca primele 3

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Dreptunghi

L = 25 cm

l = 15 cm

P = 2 x (L + l) = 2 x (25 + 15) = 2 x 40 = 80 cm

A = L x l = 25 x 15 = 375 cm^2

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l = 33 cm

A = 1452 cm^2

L = A : l = 1452 : 33 = 44 cm

P = 2 x (L + l) = 2 x (44 + 33) = 2 x 77 = 154 cm

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l = 20 cm

P = 120 cm

P = 2 x (L + l)

L + l = P : 2 = 120 : 2 = 60 cm

L = 60 - l = 60 - 20 = 40 cm

A = L x l = 40 x 20 = 800 cm^2

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a treia linie din tabel se rezolva in acelasi fel ca a doua.