3 years ago

A arch weighs about 20000 tons. write an amount that could be the exact number of tons

1 answer:

8 0

The arche's weight could range from 15,000 tonnes to 24,999 tonnes beacause if you round them to the nearest 10,000 it would come out as 20,000.

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To obtain the area of a sector, what fraction is multiplied by the area of a circle (A = πr2)?

romanna [79]

Let r be a radius of a given circle and α be an angle, that corresponds to a sector.

The circle area is $A=\pi r^2$ and denote the sector area as $A_1$ .
Then $\dfrac{A_1}{A}= \dfrac{\alpha}{2\pi}$ (the ratio between area is the same as the ratio between coresponding angles).

$A_1=\dfrac{\alpha}{2\pi} \cdot A=\dfrac{\alpha}{2\pi} \cdot \pi r^2= \dfrac{r^2\alpha}{2}$ .

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3 years ago

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masya89 [10]

Answer:

-64

Step-by-step explanation:

we should put -2 for j and -1 for k,