pi = 3.1415926535897932384626433832795...
pi to the tenths = 3.1
pi to the hundredths = 3.14
pi to the thousandths = 3.142
pi to the ten-thousandths = 3.1416
pi to the 10th decimal places = 3.1415926536
etc.
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10=2*pi*r Solve for r: 10/(2*pi)=r 1.591=r so radius rounded to nearest tenth is 1.6
Area of a circle = (pi) x (radius)2 = (pi) x (4)2 = 16 pi = 50.3 in2 (rounded)
diammeter*pi= 10 divide both side by pi to find the diameter: diameter = 3.183098862 or 3 cm to the nearest cm.
725.466
Area of whole circle = pi*r2 = 64*pi Area of Sector = Area of Whole Circle * Angle of Sector/Angle of Whole Circle = Area of Whole Circle * 120/360 = Area of Whole Circle / 3 = 64*pi/3 = 67.0 to the nearest tenth.