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The Sun's angular diameter is measured t...

The Sun's angular diameter is measured to be 1920". The distance D of the Sun from the Earth is `1.496xx109^(11)` m. What is the diameter of the Sun ?

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Here
`alpha=1920..=1920xx 4.85xx10^(-6)` rad
`D=1.496xx10^(11) m`
`rArr alpha=(d)/(D)`
`:.d=alphaD`
`=1920xx4.85xx10^(-6)xx1.496xx10^(11)`
`=13930.75xx10^(5)`
`:. D=1.393x10^(9)m`
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