Calculate the solid angle subtended by the periphery of an area of `1 cm^2` at a point situated symmetrically at a distance of 5

We know that solid angle`Omega="Area"/("Distance")^(2)`
`=(1cm^(2))/((5 cm)^(2))=1/25=4xx10^(-2)"steradian"`
`" "(therefore "Area"=1 cm^(2),"distance"=5 cm)`

Calculate the solid angle subtended by the periphery of an area of `1 cm^2` at a point situated symmetrically at a distance of 5 cm from the area.

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