Mathematics, 03.07.2019 09:00 desmiyoungmoore

In △abc, the coordinates of vertices a and b are a(−2,4) and b(−1,1). for each of the given coordinates of vertex c, is △abc a right triangle? select right triangle or not a right triangle for each set of coordinates.

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Answer from: alanizyc

Given coordinates of vertices A and B are A(−2,4) and B(−1,1).

Slope of AB is : $m=\frac{1-4}{-1-\left(-2\right)} =-3.$

With coordinate C(2,2).

Slope of BC is: $m=\frac{1-4}{-1-\left(-2\right)}=-3$

Slopes of AB and BC are same, therefore with C(2,2) is not a right triangle.

With coordinate C(0,4)

Slope of BC is $m=\frac{4-1}{0-\left(-1\right)}=3$ .

Slopes of AB and BC are not negative reciprocals.

Therefore, C(0,4) also not a coordinate to make a right triangle.

With coordinate (-2,1)

Slope of BC is $m=\frac{1-1}{-2-\left(-1\right)}=0$

Therefore, C(-2,1) also not a coordinate to make a right triangle.

Answer from: taylorrcho977

For the given coordinates of vertex C of Option A and Option C ,△ABC is a right triangle.

Step-by-step explanation:

Coordinates of A = (−2,4)

Coordinates of B =(−1,1)

Since we are asked For each of the given coordinates of vertex C, is △ABC a right triangle

So, Option 1)

Coordinates of C = (2,2)

Now to find length of AB, BC and AC

Distance formula: $d=\sqrt{(x_2-x_1)^2+(y_2-y_1)^2}$

(x_1,y_1)=(-2,4)

(x_2,y_2)=(-1,1)

Substitute the vales in the formula

$AB=\sqrt{(-1+2)^2+(1-4)^2}$

$AB=\sqrt{10}$

(x_1,y_1)=(-1,1)

(x_2,y_2)=(2,2)

Substitute the vales in the formula

$BC=\sqrt{(2+1)^2+(2-1)^2}$

$BC=\sqrt{10}$

(x_1,y_1)=(-2,4)

(x_2,y_2)=(2,2)

Substitute the vales in the formula

$AC=\sqrt{(2+2)^2+(2-4)^2}$

$AC=\sqrt{20}$

So, $AB=\sqrt{10}$ , $BC=\sqrt{10}$ and $AC=\sqrt{20}$

Now to check whether it is a right angled triangle or not

We will use Pythagoras theorem

Hypotenuse^2=Perpendicular^2+Base^2

$(\sqrt{20})^2=(\sqrt{10})^2+(\sqrt{10})^2$

20=10+10

20=20

So, For Option 1 , △ABC is a right triangle.

Option 2)

Coordinates of C = (0,4)

Now to find length of AB, BC and AC

Distance formula: $d=\sqrt{(x_2-x_1)^2+(y_2-y_1)^2}$

(x_1,y_1)=(-2,4)

(x_2,y_2)=(-1,1)

Substitute the vales in the formula

$AB=\sqrt{(-1+2)^2+(1-4)^2}$

$AB=\sqrt{10}$

(x_1,y_1)=(-1,1)

(x_2,y_2)=(0,4)

Substitute the vales in the formula

$BC=\sqrt{(0+1)^2+(4-1)^2}$

$BC=\sqrt{10}$

(x_1,y_1)=(-2,4)

(x_2,y_2)=(0,4)

Substitute the vales in the formula

$AC=\sqrt{(0+2)^2+(4-4)^2}$

AC=4

So, $AB=\sqrt{10}$ , $BC=\sqrt{10}$ and AC=4

Now to check whether it is a right angled triangle or not

We will use Pythagoras theorem

Hypotenuse^2=Perpendicular^2+Base^2

$(4)^2=(\sqrt{10})^2+(\sqrt{10})^2$

16=10+10

$16 \neq20$

So, For Option 2, △ABC is not a right triangle.

Option 2)

Coordinates of C = (-2,1)

Now to find length of AB, BC and AC

Distance formula: $d=\sqrt{(x_2-x_1)^2+(y_2-y_1)^2}$

(x_1,y_1)=(-2,4)

(x_2,y_2)=(-1,1)

Substitute the vales in the formula

$AB=\sqrt{(-1+2)^2+(1-4)^2}$

$AB=\sqrt{10}$

(x_1,y_1)=(-1,1)

(x_2,y_2)=(-2,1)

Substitute the vales in the formula

$BC=\sqrt{(-2+1)^2+(1-1)^2}$

BC=1

(x_1,y_1)=(-2,4)

(x_2,y_2)=(-2,1)

Substitute the vales in the formula

$AC=\sqrt{(-2+2)^2+(1-4)^2}$

AC=3

So, $AB=\sqrt{10}$ , BC=1 and AC=3

We will use Pythagoras theorem

Hypotenuse^2=Perpendicular^2+Base^2

$(\sqrt{10})^2=(3)^2+(1)^2$

10=9+1

10=10

So, For Option 3, △ABC is a right triangle.

Hence For the given coordinates of vertex C of Option A and Option C ,△ABC is a right triangle.

Answer from: Quest

1. 0.3 •4 is the same as 4 groups of 0.32. 7•0.8 is the same as 7 groups of 0.83. it increases by 0.5 every time, so 0.5x4 it increases by 0.9 every time, so 0.9x5. 0.9•12=10.86. 0.47•5=2.35i can finish the next ones in a separate post
Can someone plz me 1 to 37 . i will earn 10 points

Can someone plz me 1 to 37 . i will earn 10 points

Answer from: Quest

answer is the third choice:

3x^5+4x^4+x^3+2x^2-10x-7=0

step-by-step explanation:

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In △abc, the coordinates of vertices a and b are a(−2,4) and b(−1,1). for each of the given coordina...

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