Find the area of the circular ring whose external and internal diameters are 20 cm and 6 cm, respectively.
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Step-by-step explanation:
area of a circular ring = π( R1 square- R2 square)
where R1 is external radius and R2 is internal radius
R1=20cm
R1 square= 400 cm square
R2= 6cm
R2 square= 36 cm square
π= 3.14159265
area= π(R1 square - R2 square)
=3.14159265(400-36)
=3.14159265(364)
=1143.539 cm square
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