Help me in this math question?
2016-12-26 10:07 pm
The radius of a circular micro-organism is 2.8*10^-7 cm.Calculate the circumference and area of the micro-organism ,giving your answer in the standard form.
回答 (2)
2016-12-26 10:29 pm
C = 2π x [ 2•8 ] x 10^(-7) cm
C = 17•6 x 10^(-7) cm
C = 1•76 x 10^(-6) cm
A = π r²
A = π x 2•8² x 10^(-14) cm²
A = 24•6 x 10^(-14) cm²
A = 2•46 x 10^(-13) cm²
C = 17•6 x 10^(-7) cm
C = 1•76 x 10^(-6) cm
A = π r²
A = π x 2•8² x 10^(-14) cm²
A = 24•6 x 10^(-14) cm²
A = 2•46 x 10^(-13) cm²
2016-12-26 10:13 pm
circumference = 2xPi x r = 2x 3,14x 2.8*10^-7 cm
area = pi x r^2 = 3.14 x (2.8*10^-7)^2 cm^2
area = pi x r^2 = 3.14 x (2.8*10^-7)^2 cm^2
收錄日期: 2021-05-01 20:55:18
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