$\bf \textit{area of a circle}\\\\ A=\pi r^2~~ \begin{cases} r=radius\\ \cline{1-1} A=452\frac{4}{7} \end{cases}\implies 452\frac{4}{7}=\pi r^2\implies \cfrac{3168}{7}=\pi r^2 \implies \cfrac{3168}{7\pi }=r^2 \\\\\\ \stackrel{\pi =\frac{22}{7}}{\cfrac{3168}{7\cdot \frac{22}{7}}}=r^2\implies \cfrac{3168}{22}=r^2\implies 144=r^2\implies \sqrt{144}=r\implies 12=r \\\\[-0.35em] \rule{34em}{0.25pt}\\\\ ~\hfill \stackrel{diameter=2r}{d=24}~\hfill$

6 0

2 years ago

Ellus

butalik [34]

9514 1404 393

Answer:

2.25

Step-by-step explanation:

Add the square of half the x-coefficient to complete the square.

(-3/2)² = 9/4 = 2.25

4 0

2 years ago

If 2+3+6+9=21 then does 7x3=21?

Oxana [17]

Answer:

Yes

Step-by-step explanation:

If you do 7x3 it equals 21.

7 0

2 years ago

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How many degrees is the angle below?

umka2103 [35]

Answer:

30 degrees

Step-by-step explanation:

the line (not at the 0) is what you measure from. Because the angle is visibly acute, we know that it must be less than 90 degrees, therefore the angle cannot be 150 degrees but 30 degrees (from the lower line)

7 0

3 years ago

Read 2 more answers