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31,4 cm = 2 * r * 3,14 cm / : 3,14 cm
10 cm = 2 * r / : 2
r = 5 cm
P = r²π
P = 5² cm * 3,14 cm = 25 cm * 3,14 cm = 78,5 cm²
Obw = 2πr
31,4 = 2πr / : 2π
31,4 / 2π = r
r = 31,4 / 2* 3,14
r = 5
Pole koła to:
P=πr^2
P= 3,14 * 5^2
P = 78,5 cm^2