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Áreas de las
figuras planas
A = l . l
l = 9 cm
Cuadrado
A = l . l
A = 9 . 9
A = 81 cm2
A = b . a
b = 9 cm
Rectángulo
A = b . a
A = 9 . 5
A = 45 cm2a =
5 cm
A = b . a
b = 8 cm
Romboide
A = b . a
A = 8 . 5
A = 40 cm2a =
5 cm
A =
b = 8 cm
Triángulo
A = 28 cm2a =
7 cm
b . a2
A = b . a
2
A = 8 . 7
2
56
2=
A =
Rombo
A = 22,5 cm2
D . d2
A = D . d
2
A = 9 . 5
2
45
2=
d = 5 cm
D =
9cm
A =
Trapecio
A = 28 cm2
7. 4=
b = 5 cm
B = 9 cm
2. B + b
a
A = B + b
2. a
a =
4 cm
A = 9 + 5
2. 4
A =
Polígono regular
A = 60 cm2
P . a2
A = P . a
2
A = (6 . 5) . 4
2
120
2=
a =
4 cm
l = 6 cm
𝑨 =
𝝅 . 𝒓𝟐Círculo
A = 50,24 cm2r = 4
cm
𝑨 = 𝝅 . 𝒓𝟐
𝑨 = 𝟑, 𝟏𝟒 . 𝟒𝟐
𝑨 = 𝟑, 𝟏𝟒 . 𝟏𝟔