help!! ~*~*~*~ fan n medal ~*~*~*~ !!!!!!!!!!! Find AC. Round the answer to the nearest tenth. (image below!!!!)

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help!! ~*~*~*~ fan n medal ~*~*~*~ !!!!!!!!!!! Find AC. Round the answer to the nearest tenth. (image below!!!!)

Mathematics
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At vero eos et accusamus et iusto odio dignissimos ducimus qui blanditiis praesentium voluptatum deleniti atque corrupti quos dolores et quas molestias excepturi sint occaecati cupiditate non provident, similique sunt in culpa qui officia deserunt mollitia animi, id est laborum et dolorum fuga. Et harum quidem rerum facilis est et expedita distinctio. Nam libero tempore, cum soluta nobis est eligendi optio cumque nihil impedit quo minus id quod maxime placeat facere possimus, omnis voluptas assumenda est, omnis dolor repellendus. Itaque earum rerum hic tenetur a sapiente delectus, ut aut reiciendis voluptatibus maiores alias consequatur aut perferendis doloribus asperiores repellat.

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ill get help @Keigh2015 @Mehek14
This is a classic example of the cosine rule Do you know the cosine rule?

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a^2+b^2=c^2 ?
no - htat is the Pythagoras rule cosine rule is a^2 = b^2 + c^2 - 2bc cos(A) do oyu recognise that?
yes i do
so 1.3^2 is equal to x^2 + 1.1^2
OK - well you need to just get a handle on the meaning of a,b c and angleA and refer them to the values in your diagram you are directly given in the drawing the equivalent of b, c and angleA so oyu can use the formula as I gave it to solve for a (which is the side AC in your diagram)
|dw:1437053951148:dw| put the values from your drawing into the diagram above then use cosine formula to solve for a
hte formula you gave me makes no sense with te triangle
the**
That's why I said you need to understand the formula and what a,b,c and A mean However my diagram above gives you more guidance replace the values in your drawing with the letters in my diagram - THEN it corresponds with the formula.
x^2= 2.9
is as far as i got... - 2bc doesnt make any sense
so when I asked if oyu recognised the cosine rule you said yes but it seems oyu don't You need to review oyur notes or study "Cosine Rule" and understand it , before you can answer this question. This is evidently the topic oyu are studying - so refer to your class , or your text, or search online - but you must understand it before you can answer this
will you attempt to explain?
I'm afraid I don't have time to go back to the beginning the question is a classic example of the 'cosine rule' (sometimes called 'law of cosine' and allows you to solve a triangle when you know 2 sides and the include angle (as in oyur drawing). The only slightly tricky bit is the 'nomenclature' i.e. which side is a,b ,c and which angle is A look here for an explanation https://en.wikipedia.org/wiki/Law_of_cosines with the cosine rule and the sine rule you can solve nearly all problems about triangles

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