Question

Determine a área das figuras a seguir

Answer 1

a) Area do trapezio
Dados :
>>>>>>>
base maior = B = 20cm
base menor = b = 10cm
altura = h = 6cm

Formula :
>>>>>>>>>
A = B + b x h
......._______
...............2

A = 20 + 10 x 6
......._________
................2

A = 30 x 6
......._____
............2

A = 180
.......___
..........2

A = 90 cm^2

b) Area da coroa circular :
dados :
>>>>>>>
D = 10cm
d = 6 cm
pi = 3,14

Foemula :
>>>>>>>>>
A = pi ( D ^2 - d^2 )
A = pi ( 10^2 - 6^2)
A = pi ( 100 - 36 )
A = pi. 64
A = 64.pi
ou
A = 64.pi
A = 64 x 3,14
A = 200,96cm^2

c) Area do triangulo retangulo :
Dados :
>>>>>>>
hipotenusa : 10cm
Cateto adjacente = 8cm
h = ???

Foemula :
>>>>>>>>>
( hipotenusa )^2 = (Cateto oposto )^2 + ( Cateto adjacente )^2

(10)^2 = h^2 + (8)^2

100 = h^2 + 64

h^2 = 100 - 64

h^2 = 36

h = \/36

h = 6

Area do triangulo :
>>>>>>>>>>>>>>>>>
A = b x h
......____
..........2

A = 8 x 6
.......____
..........2

A = 48
.......__
.........2

A = 24 cm^2

d) Area dessa figura geometeica
triangulo :
>>>>>>>>>>
dados :
>>>>>>>
b = 2cm
h = 2cm

Formula :
>>>>>>>>
A1 = b x h
.......____
...........2

A1 = 2 x 2
.......____
...........2

A1 = 4
..... .__
........2

A1 = 2 cm^2

retangulo menor :
>>>>>>>>>>>>>>>>
dados :
>>>>>>>
b = 6 cm
h= 2cm

Formula :
>>>>>>>>
A2 = b x h
A2 = 6 x 2
A2 = 12 cm^2

retangulo maior :
>>>>>>>>>>>>>>>
dados :
>>>>>>>
b = 4cm
h = 8cm

Fomula :
>>>>>>>>
A3 = b x h
A3 = 4 x 8
A3 = 32 cm^2

Area total das tres figuras geometricas :

At = A1 + A2 + A3
At = 2 + 12 + 32 cm^2
At = 14 + 32 cm^2
At = 46 cm^2