The best choice would probably be the third option from the top. Since by using the distance formula you can solve for the length or distance of each of the sides of the triangle, and check to see if it is equal. As would be in an equilateral triangle.
Slope wouldn’t be best for the last leg or bottom leg as there is no change in y and x.
Hey!
The length of the car is 10 feet long. The length of the model is 7 inches long.
Length of the car to length of the model is: 10:7

Answer: The price for the product is R$5.
Step-by-step explanation: Suppose the unit price of the product is X.
T is all the money I have.
In the first option, 20 units spend all my money, so:
T = 20x
In the second option, if I buy 14 of it, I have a remaining of R$30, so:
T = 14.x + 30
To determine the unit valor:
20x = 14x + 30
20x - 14x = 30
x = 
x = 5
The product costs R$5.
Long piece: 5x + 3
Short piece: x
Long + Short = Total
5x + 3 + x = 45
6x + 3 = 45
6x = 42
x = 7
Long piece: 5x + 3 = 5(7) + 3 = 35 + 3 = 38
Answer: short = 7 ft, long = 38 ft