Arihangdu
  • Arihangdu
In triangle ABC, triangle C is a right angle. Find the remaining sides and angles. Round your answer to the nearest tenth. a=3, c=19
Mathematics
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SOLVED
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schrodinger
  • schrodinger
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Arihangdu
  • Arihangdu
Use Pythagoras relationship. A^2 + b^2= c^2
wolf1728
  • wolf1728
c would be the hypotenuse so c^2 = a^2 + b^2 19^2 = 3^2 + b^2 361 = 9 + b^2 352 = b^2 b = sq root (352)
Arihangdu
  • Arihangdu
Ok I found the side c=18.8 but I need to find Angels now

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wolf1728
  • wolf1728
yes side c = 18.7616630393 To find the angles you need to use trigonometry
wolf1728
  • wolf1728
It would help to have a graphic - I'll make one
Arihangdu
  • Arihangdu
Ok
Arihangdu
  • Arihangdu
I have no idea what to use please help me to solve this
anonymous
  • anonymous
In triangle ABC, triangle C is a right angle. Find the remaining sides and angles. Round your answer to the nearest tenth. a=3, c=19 sin(A) = 3/19 ------------ B = 90 - A
anonymous
  • anonymous
ur anwers above
Arihangdu
  • Arihangdu
What is B== 90-A is ? I lost
anonymous
  • anonymous
sin(A) = 3/19 ------------ B = 90 - A
wolf1728
  • wolf1728
Okay here's the graphic
1 Attachment
anonymous
  • anonymous
did it at least help you my explanation
wolf1728
  • wolf1728
the sine of angle a = opposite/hypotenuse the sine of angle a = 3/19
Arihangdu
  • Arihangdu
Ok
wolf1728
  • wolf1728
we need to find what angle has a sine of 0.1578947368 (which is 3/19) To do this we need to find the arc sine of 0.1578947368 Here's a good calculator to use: http://www.1728.org/trigcalc.htm
Arihangdu
  • Arihangdu
Please help me find that please
wolf1728
  • wolf1728
Okay if you go to the calculator, input 0.1578947368 where it says Input >>> <<<
Arihangdu
  • Arihangdu
After that what to solve?
wolf1728
  • wolf1728
You are solving for angle a which equals 9.0847 Degrees Then to solve angle b you calculate 90 - 9.0847 Degrees which equals 80.9153 degrees
wolf1728
  • wolf1728
That should be all the sides and angles you had to solve. Any questions about any of that?
Arihangdu
  • Arihangdu
What is arcsine means? Is inverse of sine?
Arihangdu
  • Arihangdu
I'm have only It84
Arihangdu
  • Arihangdu
Is asine is inverse of sine?
Arihangdu
  • Arihangdu
I'm still confused on sinA =c/b ................................................ B=90-A. What it means ? Please

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