Mathematics, 09.01.2020 19:31, ElizabethF

15 points and will mark brainliest

what is the area of the composite figure whose vertices have the following coordinates?

(−8,3) , (−4,4) , (−1,1) , (−4,−2) , (−8,−2)

enter your answer in the box.

2.the coordinates of the vertices of a polygon are (−2, −1) , (2, 3) , (4, 3) , (4, −3) , and (−1, −4) .

round each side length to the nearest tenth of a unit.

enter the perimeter of the polygon in the box.

Answers: 3

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Answers

1) The area of the composite figure whose vertices have the coordinates (−8,3) , (−4,4) , (−1,1) , (−4,−2) , (−8,−2) is (20 + 4 + 3) = 27 unit²

Step-by-step explanation:

1) Given : coordinate of a composite figure (−8,3) , (−4,4) , (−1,1) , (−4,−2) , (−8,−2)

We have to find the area of the composite figure whose vertices have the given coordinates.

We first plot the given coordinate and obtained the figure as shown in attachment below.

Join points (−8,3) and (−4,−2)

and (−4,4) and (−4,−2)

Thus, we have obtained three triangles.

Area of triangle having coordinates (a_x,a_y),(b_x,b_y),(c_x,c_y) is given by ,

$\left | \frac{a_x(b_y-c_y)+b_x(c_y-a_y)+c_x(a_y-b_y}{2} \right |$

Thus, for triangle with coordinate (−8,3) ,(-8, -2)and (−4,−2)

Area is given by

$\left | \frac{-8(-2+2)+(-8)(-2-3)+(-4)(3-(-2)}{2} \right |$

thus area for triangle with coordinate (−8,3) ,(-8, -2)and (−4,−2) is 20 unit²

Similarly, for triangle with coordinate (−8,3) ,(-4,-4)and (−4,−2)

Area is given by

$\left | \frac{-8(-4+2)+(-4)(-2-3)+(-4)(3-(-4)}{2} \right |$

thus area for triangle with coordinate (−8,3) ,(-8, -2)and (−4,−2) is 4 unit²

Similarly, for triangle with coordinate (−1,1) ,(-4,-4)and (−4,−2)

Area is given by

$\left | \frac{-1(-4+2)+(-4)(-2-1)+(-4)(1-(-4)}{2} \right |$

thus area for triangle with coordinate (−8,3) ,(-8, -2)and (−4,−2) is 3 unit²

Thus, the area of the composite figure whose vertices have the coordinates (−8,3) , (−4,4) , (−1,1) , (−4,−2) , (−8,−2) is (20 + 4 + 3) = 27 unit²

Given : The coordinates of the vertices of a polygon are (−2, −1) , (2, 3) , (4, 3) , (4, −3) , and (−1, −4) .

We have to find the perimeter of the polygon.

We first plot these point to obtain the polygon.

Using distance formula $\left(x_1,\:y_1\right),\:\left(x_2,\:y_2\right):\quad \sqrt{\left(x_2-x_1\right)^2+\left(y_2-y_1\right)^2}$

thus, we find the distance between each two points using above formula,

we have

a) $\mathrm{Distance\:between\:}\left(-2,\:-1\right)\mathrm{\:and\:}\left(2,\:3\right)$

$=\sqrt{\left(2-\left(-2\right)\right)^2+\left(3-\left(-1\right)\right)^2}=4\sqrt{2}=5.7$

$\mathrm{The\:distance\:between\:}\left(2,\:3\right)\mathrm{\:and\:}\left(4,\:3\right)\mathrm{\:is\:}$

$=\sqrt{\left(4-2\right)^2+\left(3-3\right)^2}=2$

$\mathrm{The\:distance\:between\:}\left(4,\:3\right)\mathrm{\:and\:}\left(4,\:-3\right)\mathrm{\:is\:}$

$=\sqrt{\left(4-4\right)^2+\left(-3-3\right)^2}=6$

$\mathrm{The\:distance\:between\:}\left(4,\:-3\right)\mathrm{\:and\:}\left(-1,\:-4\right)\mathrm{\:is\:}$

$=\sqrt{\left(-1-4\right)^2+\left(-4-\left(-3\right)\right)^2}=\sqrt{26}=5.1$

$\mathrm{The\:distance\:between\:}\left(-1,\:-4\right)\mathrm{\:and\:}\left(-2,\:-1\right)\mathrm{\:is\:}$

$=\sqrt{\left(-2-\left(-1\right)\right)^2+\left(-1-\left(-4\right)\right)^2}=\sqrt{10}=3.2$

thus, perimeter is sum of all distance is 22 units.

Thus, the perimeter of the coordinates of the vertices of a polygon are (−2, −1) , (2, 3) , (4, 3) , (4, −3) , and (−1, −4) is 22 units.

15 points and will mark brainliest what is the area of the composite figure whose vertices have the

answered: Guest

answer: 457.14

step-by-step explanation:

205 - 45 = 160

160 / .35 = 457.142857

answered: Guest

Do the math. she originally had 50 dollars on her gift card and she had 12 dollars left on her gift card after she finished her shopping spree. if you subtract 50 minus 12 you get thirty eight dollars as your answer. so therefore, ciara spent 38 dollars total o