Answer:
Solution given:
1:
by using cosine rule
d²=e²+f²-2efCosD
d²=13²+23²-2*13*23*Cos110°
d=
d=30
2:
m²=n²+p²-2np Cos M
2*12*15Cos M=12²+15²-9²
360CosM=288
CosM=
M=Cos-¹(4/5)
m<M=37°
3:
the required equation is:
a²=10²+6²-2*10*6*CosA
a²=136-120CosA
a=
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Answers & Comments
Answer:
Solution given:
1:
by using cosine rule
d²=e²+f²-2efCosD
d²=13²+23²-2*13*23*Cos110°
d=![\sqrt{902.53} \sqrt{902.53}](https://tex.z-dn.net/?f=%5Csqrt%7B902.53%7D)
d=30
2:
by using cosine rule
m²=n²+p²-2np Cos M
2*12*15Cos M=12²+15²-9²
360CosM=288
CosM=![\frac{288}{360} \frac{288}{360}](https://tex.z-dn.net/?f=%5Cfrac%7B288%7D%7B360%7D)
M=Cos-¹(4/5)
m<M=37°
3:
the required equation is:
a²=10²+6²-2*10*6*CosA
a²=136-120CosA
a=![\sqrt{136-120CosA} \sqrt{136-120CosA}](https://tex.z-dn.net/?f=%5Csqrt%7B136-120CosA%7D)