Who's shaw?
anyway
area=pi times radius^2
pi=3.14
area=78.5
78.5=3.14 times radius^2
divide both sides by 3.14
25=r^2
sqrt both sides
5=r
the radius is 5cm
X=3
y=2
I'm just writing to make this 20 characters.
Answer:
This question does not make since.
Step-by-step explanation:
Given:
In triangle ABC, a = 6, c = 4, and B = 75°.
To find:
The measure of b.
Solution:
According to the Law of Cosine:
![b^2=a^2+c^2-2ac\cos B](https://tex.z-dn.net/?f=b%5E2%3Da%5E2%2Bc%5E2-2ac%5Ccos%20B)
Substituting the given values in the above formula, we get
![b^2=(6)^2+(4)^2-2(6)(4)\cos (75^\circ)](https://tex.z-dn.net/?f=b%5E2%3D%286%29%5E2%2B%284%29%5E2-2%286%29%284%29%5Ccos%20%2875%5E%5Ccirc%29)
![b^2=36+16-48(0.2588)](https://tex.z-dn.net/?f=b%5E2%3D36%2B16-48%280.2588%29)
![b^2=52-12.4224](https://tex.z-dn.net/?f=b%5E2%3D52-12.4224)
![b^2=39.5776](https://tex.z-dn.net/?f=b%5E2%3D39.5776)
Taking square root on both sides, we get
![b=\sqrt{39.5776}](https://tex.z-dn.net/?f=b%3D%5Csqrt%7B39.5776%7D)
![b=6.291073](https://tex.z-dn.net/?f=b%3D6.291073)
![b\approx 6.29](https://tex.z-dn.net/?f=b%5Capprox%206.29)
The measure of side b is 6.29 units.
Therefore, the correct option is B.