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tamaranim1 [39]
3 years ago
11

The radius of a circle is 3.9 cm. What is the area of the circle? Use pi = 3.14

Mathematics
2 answers:
ivolga24 [154]3 years ago
6 0

Answer:

A ≈ 47.759 cm²

Step-by-step explanation:

A = πr²

A = (3.14)(3.9)²

A = (3.14)(15.21)

A ≈ 47.759 cm²

Arlecino [84]3 years ago
6 0
Because the area of a circle equals pi times radius squared and the radius is 3.9 A= 47.78
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3 years ago
8 + 8r = 3 + 3r can anyone can help me out​
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How to solve a one step equation of R+3= -6 1/2 <br> please show all the work
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Solve for R:
R + 3 = -(1/2 + 6)
Put 1/2 + 6 over the common denominator 2. 1/2 + 6 = (2×6)/2 + 1/2:
R + 3 = -(2×6)/2 + 1/2
2×6 = 12:
R + 3 = -(12/2 + 1/2)
12/2 + 1/2 = (12 + 1)/2:
R + 3 = -(12 + 1)/2
12 + 1 = 13:
R + 3 = -13/2
Subtract 3 from both sides:
R + (3 - 3) = -13/2 - 3
3 - 3 = 0:
R = -13/2 - 3
Put -13/2 - 3 over the common denominator 2. -13/2 - 3 = (-13)/2 + (2 (-3))/2:
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Answer:  R = (-19)/2
6 0
4 years ago
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