3 years ago

Pls help me

Mathematics

2 answers:

Lina20 [59]3 years ago

5 0

Answer:

8 pi m

Step-by-step explanation:

area of a circle is 2r pi

2(4) pi = 8 pi

stiks02 [169]3 years ago

5 0

Answer:

50.27

Step-by-step explanation:

Formula of the Area of Circles: pi * r^2

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Find in degrees the numeric value of the acute angle of rotation that eliminates the product term from the equation 7x2+24xy−34x

lutik1710 [3]

Rotating the graph of $Ax^2+Bxy+Cy^2+Dx+Ey+F=0$ with $B\ne0$ counterclockwise by $\theta$ eliminates the $xy$ term, where $\cot2\theta=\frac{A-C}{B}.$ Plugging in, we have $\cot2\theta=\frac{7}{24},$ since $C=0.$ Solving, we have $\theta=\frac{1}{2}\cot^{-1}(\frac{7}{24})\approx\boxed{36.9^\circ}.$