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किसी त्रिभुज ABC में यदि `a=18,b=24` तथा `c=30` है तो , `sinA,sinB` व `sinC` का मान ज्ञात कीजिए ।

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दिया है : `a=18, b=24,c=30`
`rArr s=(a+b+c)/(2)=(18+24+30)/(2)=36`
हम जानते है कि `sinA=(2)/(bc)sqrt(s(s-a)(s-b)(s-c))`
`=(2)/(24xx30)sqrt(36(36-18)(36-24)(36-30))`
`=(1)/(12xx30)sqrt(36xx18xx12xx6)`
`=(1xx18xx2xx6)/(12xx30)=(3)/(5)`
इसी प्रकार हम निम्न के मान ज्ञात कर सकते है ।
`sinB=(4)/(5),sinC=1`

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