Question

me ajudar por favor urgente​

Answer 1

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a) Trapézio

Temos que:

• B = 20 cm
• b = 15 cm
• h = 10 cm

$\sf A=\dfrac{(B+b)\cdot h}{2}$

$\sf A=\dfrac{(20+15)\cdot10}{2}$

$\sf A=\dfrac{35\cdot10}{2}$

$\sf A=\dfrac{350}{2}$

$\boxed{\sf A=175~cm^2}$

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b) Círculo

Temos que:

• r = 4 cm
• π = 3,14

$\sf A=\pi\cdot r^2$

$\sf A=3,14\cdot4^2$

$\sf A=3,14\cdot16$

$\boxed{\sf A=50,24~cm^2}$

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c) Paralelogramo

Temos que:

• b = 16 cm
• h = 9 cm

$\sf A=b\cdot h$

$\sf A=16\cdot9$

$\boxed{\sf A=144~cm^2}$

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d) Losango

Temos que:

• D = 18 cm
• d = 5 cm

$\sf A=\dfrac{D\cdot d}{2}$

$\sf A=\dfrac{18\cdot5}{2}$

$\sf A=\dfrac{90}{2}$

$\boxed{\sf A=45~cm^2}$