1.

If the area of isosceles triangle is 8*√3 then the opposite side of angle 20 is ?​

Answer»

ANSWER:

CONSIDER any TRIANGLE ΔABC.ΔABC.

In right triangle ΔABD,ΔABD,

sinθ=BDABsin⁡θ=BDAB

BD=ABsinθBD=ABsin⁡θ

The area of this triangle is EASY right?

ar(ΔABC)=12BD⋅ACar⁡(ΔABC)=12BD⋅AC

ar(ΔABC)=12AB⋅ACsinθar⁡(ΔABC)=12AB⋅ACsin⁡θ

We can generalise this as follows, the area of a triangle with consecutive sides a,BA,b and included angle θθ is 12absinθ.12absin⁡θ.

Apllying this to your question,

A=1220×20×12–√A=1220×20×12

A=1002–√ cm2


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