Question

determine a area e o comprimento das circunferencias cujos os raios medem a) R=75m b) R=125m c) 175cm e) 0,07m

Answer 1

a.
C = 2 * 75 * 3,14
C = 471 m
A = 75² * 3,14
A = 17.662,5 m²

b.
C = 2 * 125 * 3,14
C = 250 * 3,14
C = 785 m
A = 125² * 3,14
A = 15.625 * 3,14
A = 49,.062,5 m²

c.
C = 2 * 175 * 3,14
C = 350 * 3,14
C = 1.099 cm
A = 175² * 3,14
A = 30.625 * 3,14
A = 96.162,5 cm²

d.
C = 2 * 0,07 * 3,14
C = 0,14 * 3,14
C = 0,4.396 m
A = 0,07² * 3,14
A = 0,015386 m²

Answer 2

a) C= $2 \pi r$
C= 2.3,14.75=
C= 471cm

A= $\pi r^{2}$
A= 3,14.75²=
A= 3,14.5625
A= 17.622, 5cm²
b) C= 2.3,14.125=
C= 785cm
A= 3,14.125²=
A= 3,14.15625
A= 49062, 5cm²

c) C= 2.3,14.175
C= 1.099cm

A= 3,14.175²
A= 3,14.30625
A= 96.162, 5cm²

d) C= 2.3,14.0,07
C= 0, 4396cm

A= 3,14.0,07²
A= 0, 015386cm²

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