Find the surface area of a sphere whose diameter is equal to 28 cm
A131π cm²
B938π cm²
C1199π cm²
D784π cm²
A131π cm²
B938π cm²
C1199π cm²
D784π cm²
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ABC is an equilateral triangle with side 6 centimetres. The sides of the triangle are tangents to the circle. The radius of the circle is: