Find the lengths of the sides of rectangle ABCD shown on the coordinate plane. Suppose you double the length of each side. What would be the new coordinates of point C if the coordinates of point A stay the same​? Use pencil and paper to explain your reasoning.

Respuesta :

Answer:

(6, 8)

Step-by-step explanation:

The rectangle ABCD has vertices at A(0,0), B(0,4), C(3,4) and D(3,0). The length of the sides is calculated using the distance formula:

[tex]Distance=\sqrt{(x_2-x_1)^2+(y_2-y_1)^2}[/tex]

Therefore:

[tex]|AB|=\sqrt{(0-0)^2+(4-0)^2}=4 \\\\|BC|=\sqrt{(3-0)^2+(4-4)^2}=3\\\\|CD|=\sqrt{(3-3)^2+(0-4)^2}=4\\\\|AD|=\sqrt{(3-0)^2+(0-0)^2}=3[/tex]

If the length of each side is doubled and point A stays the same. Let us assume that the new point of C is C'(x, y). Therefore C would be the midpoint of segment |AC'|:

[tex]3=\frac{0+x}{2}\\\\x=6\\\\4=\frac{0+y}{2}\\\\y=8[/tex]

Therefore C'=(6,8)

The new coordinate of point C would be (6, 8)