7,000
B.
700
C.
70
D.
7
Answer:
C.70 hope this helped
Step-by-step explanation:
Answer: 92cm2
Step-by-step explanation:
top shape
A = lw
= 7 * 4
= 28cm2
bottom shape
A = lw
= 4 * 10
= 40cm2
triangle
A = bh/2
= 8*3
= 24cm2
28+40+24 = 92cm2
Answer:
The image of point (x , y) by dilation with center origin and scale factor k is (kx , ky)
Step-by-step explanation:
* Lets talk about dilation
- A dilation is a transformation that changes the size of a figure.
- It can become larger or smaller, but the shape of the
figure does not change.
- The scale factor, measures how much larger or smaller
the image will be
- If the scale factor greater than 1, then the image will be larger
- If the scale factor between 0 and 1, then the image will be smaller
* In a problem of dilation
∵ The center of dilation is the origin
∵ The scale factor of dilation is k
∵ The point is (x , y)
- In dilation with center origin and scale factor k to find the image
of the point multiply each coordinates of the point by the scale
factor k because the distance d between the point and the
origin will be equal kd which is the distance between the origin
and the image of the point d is depending on the coordinates
of the point
∴ The image of point (x , y) by dilation with center origin and
scale factor k is (kx , ky)
* Ex: If point A is (3 , 4)
∵ The distance from the origin to point A =
∵ The scale factor of dilation is 2 and the center is the origin
∴ The image of A is A' = (3 × 2 , 4 × 2) = (6 , 8)
∵ The distance from the origin to point A' =
∵ 10 ÷ 5 = 2 which is the value of the scale factor
∴ The image of point (x , y) by dilation with center origin and
scale factor k is (kx , ky)