The area of a circle is 320 square meters. Find the radius of the circle. Then find the circumference. Round your answers to the
nearest tenth.
2 answers:
Answer:
Radius = 10.1 m
Circumference = 63.4 m
Step-by-step explanation:
Area = 3.14 × r²
320 = 3.14 × r²
r² = 101.9108280255
r = 10.0950893025
Circumference = 2 × 3.14 × r
= 2 × 3.14 × 10.0950893025
= 63.3971608197
Answer:
10.1 m =r
C = 63.4 m
Step-by-step explanation:
We know the area of a circle is given by
A = pi r^2 where pi can be approximated by 3.14 and r is the radius
320 = 3.14 r^2
Divide each side by 3.14
320/3.14 = 3.14 r^2/3.14
101.910828 = r^2
Take the square root of each side
sqrt(101.910828) =sqrt( r^2)
10.0950893 = r
To the nearest tenth 10.1 =r
Now we want the circumference
C = 2*pi*r
C =2 *3.14 *10.1
C =63.428
To the nearest tenth
C = 63.4
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