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pythagoras123
 one year ago
In a triangle ABC, the ratios of the sides are such that a:b:c = 2:3:4. Calculate the value of cos C and hence find the value of sin C.
pythagoras123
 one year ago
In a triangle ABC, the ratios of the sides are such that a:b:c = 2:3:4. Calculate the value of cos C and hence find the value of sin C.

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triciaal
 one year ago
Best ResponseYou've already chosen the best response.2dw:1441947104976:dw

triciaal
 one year ago
Best ResponseYou've already chosen the best response.2dw:1441947280594:dw

pythagoras123
 one year ago
Best ResponseYou've already chosen the best response.0uh could you show how you calculate sin C using the above formulas

triciaal
 one year ago
Best ResponseYou've already chosen the best response.2given only the 3 sides of the triangle first use the cosine rule to find the largest angle ( the one opposite the longest side) then you can use the sine rule to find the other 2 angles. Here we only need to find the sin of c we already calculated C you just use the calculator to find sin C.

pythagoras123
 one year ago
Best ResponseYou've already chosen the best response.0oh my question requires it to be in exact form

pythagoras123
 one year ago
Best ResponseYou've already chosen the best response.0is there a way to find sin C without the calculator

triciaal
 one year ago
Best ResponseYou've already chosen the best response.2@jim_thompson5910 @ganeshie8 can we use the ratio of the sides of the triangle as the lengths of each side?

triciaal
 one year ago
Best ResponseYou've already chosen the best response.2@pythagoras123 use the Sin rule above

triciaal
 one year ago
Best ResponseYou've already chosen the best response.2@Nnesha @zepdrix what would be the lengths of the sides for this triangle?

pythagoras123
 one year ago
Best ResponseYou've already chosen the best response.0@triciaal we don't know any of the values for sin A, sin B or sin C

triciaal
 one year ago
Best ResponseYou've already chosen the best response.2not until after we find the largest angle. you need to read the responses more carefully.

triciaal
 one year ago
Best ResponseYou've already chosen the best response.2dw:1441948484416:dw

triciaal
 one year ago
Best ResponseYou've already chosen the best response.2dw:1441948763123:dw

pythagoras123
 one year ago
Best ResponseYou've already chosen the best response.0I get that but how do we use the value of cos C to find the value of sin C without solving for the angle C itself?

triciaal
 one year ago
Best ResponseYou've already chosen the best response.2think about your username any ideas?

pythagoras123
 one year ago
Best ResponseYou've already chosen the best response.0oh I get it now lol thx

triciaal
 one year ago
Best ResponseYou've already chosen the best response.2dw:1441949293293:dw

pythagoras123
 one year ago
Best ResponseYou've already chosen the best response.0so with just the ratios of the sides given, we can find the trig ratio?

triciaal
 one year ago
Best ResponseYou've already chosen the best response.2dw:1441949484079:dw

pythagoras123
 one year ago
Best ResponseYou've already chosen the best response.0ok thx for your help :)

triciaal
 one year ago
Best ResponseYou've already chosen the best response.2cosine rule C is the largest angle
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