3 years ago

What is the ratio of the sector area to the area of the entire circle?

Mathematics

2 answers:

inna [77]3 years ago

4 0

Answer:

One fourth

Step-by-step explanation:

$\frac{area \: of \: sector}{area \: of \: circle} = \frac{ \frac{ 90 \degree}{360 \degree } \times \pi {r}^{2}}{ \pi {r}^{2}} \\ = \frac{ \frac{1}{4} \times 1}{1} \\ = \frac{1}{4} \\ = 1 : 4$

ElenaW [278]3 years ago

3 0

Answer:

1/5

Step-by-step explanation:

the angle is 72 degrees, ratio is 72:360, simplified is 1/5

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The point (-7,4) is reflected over the line x=-3. Then the resulting point is reflected over the line y=x. Where is the point lo

Ne4ueva [31]

Answer:

(4, 1)

Step-by-step explanation:

Since the first reflection is over the vertical line x=-3, the y-coordinate remains the same. The x-coordinate of A' will make the point (-3, 4) on the line of reflection be the midpoint between A and A':

(-3, 4) = (A +A')/2

2(-3, 4) -A = A' = (-6-(-7), 8 -4) = (1, 4)

The reflection over the line y=x simply interchanges the two coordinate values:

A'' = (4, 1)