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Harrizon [31]
3 years ago
10

#18-7: Find the radius of a circle that has an area of 4.5216 cm^2. Use 3.14 for pi.

Mathematics
1 answer:
sertanlavr [38]3 years ago
8 0

Answer:

r = 1.2 cm

Step-by-step explanation:

Area (A) of a circle = πr²

r² = \frac{A}{Pi}

r = \sqrt{\frac{A}{Pi} }

r = \sqrt{\frac{4.5216}{3.14} } = 1.2 cm

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What is the arc measure, in degrees, of major arc \stackrel{\large{\frown}}{ADC} ADC ⌢ A, D, C, start superscript, \frown, end s
Mrrafil [7]

Answer:

\stackrel{\large{\frown}}{ADC}    = 186^{\circ}

Step-by-step explanation:

Given

See attachment

Required

Determine the measure of \stackrel{\large{\frown}}{ADC}

The\ sum\ of\ angles\ in\ a\ circle\ is 360^{\circ}.

So, we have:

\stackrel{\large{\frown}}{ADC} + \stackrel{\large{\frown}}{APB}  + \stackrel{\large{\frown}}{BPC}  = 360^{\circ}

Where:

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Collect Like Terms:

\stackrel{\large{\frown}}{ADC}    = 360^{\circ} - 174^{\circ}

\stackrel{\large{\frown}}{ADC}    = 186^{\circ}

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