If the radius is 18 cm and the angle at center of circle is 120° then the area of sector is а. 382.4 сm2 b. 339.3 cm2 С. 350 cm2 d. 300 cm2 If the radius is 21 cm and the angle at center of circle is 140° then the length of the arc is а.42.23 cт b. 73.24 cm С. 51.31 ст d. 62.42 cm

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