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winkwinkwink

lynx7  Feb 27, 2018
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 #1
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+2

We need to find AC

 

AC  =  sqrt [ 6^2 + 8^2  - 2(6)(8)cos (95) ]  ≈  10. 4 cm

 

And ADC forms a right triangle  with AC the hypotenuse

 

So

 

DC  = sqrt ( AC^2 - AD^2 ]

 

DC  =  sqrt ( 10.4^2  - 5^2 )  ≈ 9.12 cm

 

So....the perimeter is ≈

 

8 + 6 + 5 + 9.12  =   28.12 cm

 

 

cool cool cool

CPhill  Feb 27, 2018

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