Mathematics
lintingguo11
2015-11-02 23:02:00
The area of a circle is 78.5 cm2. What is the diameter of the circle?
ANSWERS
Shadowlearner
2015-11-03 02:56:40

hello :  The area of a circle is : A = π × r²  r² = A/π  r² = 78.5/3.14 r² = 25 r = 5 but : d = 2r    ... r : ridus and  d : the diameter so : d= 10

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