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nata0808 [166]
2 years ago
5

I need help on these problems because I don’t really get it

Mathematics
1 answer:
sleet_krkn [62]2 years ago
3 0
So for these equations you want to solve for Y
Simply the equation till you get something that looks like Y=X+5 (or any number)
Then plug in the X into your equation
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To find cosθ, use the formula for the area of a triangle i.e. AREA=1/2 x a x b x sinC.=> For this case: 15= 1/2 x 10 x 5 x sinC to find sinC.=> SinC = 3/5 thus, Arcsin(3/5)=+- 4/5 or +-0.8

To find the exact length of BC, use the cosine rule.=> c(sq)=a(sq)+b(sq)-2abCosC=> c(sq)=10(sq)+5(sq)-2(10)(5)(+-4/5)=> c(sq)= Square root of 205

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