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sumit

· started a discussion

· 1 Months ago

rahul (Question: 394539.0 )

sin[105degree] ki value tera,,,koun btaega

Question:

In ∆ABC, AB = 12 cm, ∠ABC = 30º, ∠ACB = 45º, the area of ∆ABC is  –

Options:
A)

18 cm2

B)

18(2+3)    cm2

C)

18 \( { \sqrt{2} }\big( \sqrt{ \ 2+ \sqrt {3}} \big)\) cm2

D)

36(2+3)    cm2

Solution:

Ans: (a)


Knowledge Expert

· commented

· 1 Months ago

Sin (A+B)= sinA cosB +cos A sinB
Put A= 60 degree and B= 45 degree
put the values in given formula you will get value of sin 105 degree

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