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3 years ago

Use the formula for the area of a circle to solve for the radius of the circle if the area is 78.5cm^2

Mathematics

1 answer:

postnew [5]3 years ago

5 0

Answer:

Area = PI * radius^2

radius = Sq Root (Area / PI)

radius = Sq Root (78.5 / PI)

radius = Sq Root (24.9873260654)

radius = 4.9987

radius = 5 (rounded)

Step-by-step explanation:

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4 years ago

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NikAS [45]

Given the expression:

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Definition:

$\displaystyle \large{ y = \begin{cases} \pm \sqrt[n]{x} \longrightarrow n = (2,4,6,8,...) \: \: (x \geqslant 0) \\ \sqrt[n]{x}\longrightarrow n = (1,3,5,7,...) \: \: (x \in \R) \end{cases}}$

First, factor the -125. -125 comes from (-5)×(-5)×(-5) or (-5)^3.

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