Page 94 - IL LIBRO DELLE MAPPE4-5

MATEMATICA CLASSE QUINTA

PERIMETRO E AREA DELLE FIGURE PIANE, E LE RELATIVE FORMULE INVERSE PERIMETRO E AREA DELLE FIGURE PIANE, E LE RELATIVE FORMULE INVERSE

triangoli
PERIMETRO AREA

triangolo scaleno triangolo isoscele triangolo equilatero

<l <l 1 <l <l 2 <l <l 1 h

<l <l 3 <l <l 2 <l <l b

<l
<l
<l
<l
<l
<l
P = <l 1 + <l 2 + <l 3 P = (<l 1 x 2) + <l 2 P = <l x 3 A = (b x h) : 2
<l
<l
<l
<l <l 1 = P – (<l 2 + <l 3) <l <l 1 = (P – <l 2) : 2 <l <l = P : 3 h = (A x 2) : b
<l
<l
<l
<l <l 2 = P – (<l 1 + <l 3) <l <l 2 = P – (<l 1 x 2) b = (A x 2) : h
<l
<l
<l <l 3 = P – (<l 1 + <l 2)
parallelogrammi
rettangolo romboide
PERIMETRO AREA PERIMETRO AREA
<l
<l
<l
<l
<l
P = (<l 1 + <l 2) x 2 A = b x h <l <l 2 P = (<l 1 + <l 2) x 2 A = b x h
h
<l
<l
<l 2  h
<l <l 1 = (P : 2) – <l 2 b = A : h <l <l 1 = (P : 2) – <l 2 b = A : h
<l <l 1  b <l <l 1  b h = A : b
<l
<l
<l <l 2 = (P : 2) – <l 1 h = A : b <l <l 2 = (P : 2) – <l 1
quadrato rombo
PERIMETRO AREA PERIMETRO AREA
<l <l
A = D x (d : 2)
<l
<l
<l
<l
P = <l x 4 A = <l x <l D P = <l x 4 oppure
d A = (D x d) : 2
<l <l = P : 4 <l <l <l <l = P : 4
D = (A x 2) : d
d = (A x 2) : D
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