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2 years ago

The sum of the measures of the interior angles of a convex polygon is 1080° Classify the polygon by the number of sides

Mathematics

2 answers:

lozanna [386]2 years ago

6 0

Answer:

(n-2)×180=1080

180n -360=1080

180n = 1080+360

180n =1440

dividing by 180

n=8

hence it is a regular polygon with 8 sides .I.e it is an octagon

Step-by-step explanation:

we are given the total interior angles in the polygon and we know that the formula to find the total interior angles of a polygon is (n-2) ×180

where n is the number of sides

Firlakuza [10]2 years ago

6 0

Answer:

the answer is A

Step-by-step explanation:

just trust me.

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2 years ago

The least-squares regression model y =−3.4+5.2x and correlation coefficient r=−0.66 were calculated for a set of bivariate data

Makovka662 [10]

Answer:

$r=\frac{n(\sum xy)-(\sum x)(\sum y)}{\sqrt{[n\sum x^2 -(\sum x)^2][n\sum y^2 -(\sum y)^2]}}$

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Now we can calculate the determination coeffcient:

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Step-by-step explanation:

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And we can find the intercept using this:

$b=\bar y -m \bar x$

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$r=\frac{n(\sum xy)-(\sum x)(\sum y)}{\sqrt{[n\sum x^2 -(\sum x)^2][n\sum y^2 -(\sum y)^2]}}$

For this case the value of r = -0.66

Now we can calculate the determination coeffcient:

$r^2 = (-0.66)^2 = 0.4356$

And then we can conclude that 43.56% of the variation in y can be explained by the explanatory variable

And then 100-43.56 = 56.44 % of the variation in y that cannot be explained by the explanatory variable

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2 years ago

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ipn [44]

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2 years ago

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The sum of the measures of the interior angles of a convex polygon is 1080° Classify the polygon by the number of sides​

The sum of the measures of the interior angles of a convex polygon is 1080° Classify the polygon by the number of sides