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Vika [28.1K]
3 years ago
12

The circumference of the circle is below 25.12 centimeters which is the best estimestifor the length of the radius of the circle

Mathematics
1 answer:
kirill115 [55]3 years ago
7 0
C=2pir
c=25.12
25.12=2pir
divide both sides by 2
12.56=pir
divide both sides by 3.14 since we will use pi=3.14
4=r
radius is 4cm
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Given:

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To verify:

a(b-c)=ab-ac for the given values.

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We have,

a=1.6,b=\dfrac{1}{-2},c=\dfrac{-5}{-7}

We need to verify a(b-c)=ab-ac.

Taking left hand side, we get

a(b-c)=1.6\left(\dfrac{1}{-2}-\dfrac{-5}{-7}\right)

a(b-c)=1.6\left(-\dfrac{1}{2}-\dfrac{5}{7}\right)

Taking LCM, we get

a(b-c)=1.6\left(\dfrac{-7-10}{14}\right)

a(b-c)=\dfrac{16}{10}\left(\dfrac{-17}{14}\right)

a(b-c)=\dfrac{8}{5}\left(\dfrac{-17}{14}\right)

a(b-c)=-\dfrac{68}{35}\right)

Taking right hand side, we get

ab-ac=1.6\times \dfrac{1}{-2}-1.6\times \dfrac{-5}{-7}

ab-ac=-\dfrac{16}{20}-\dfrac{8}{7}

ab-ac=-\dfrac{4}{5}-\dfrac{8}{7}

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ab-ac=\dfrac{-28-40}{35}

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