The formula for perimeter of a triangle is:
Perimeter = side 1 + side 2 + side 3
In this case lets call:
Side 1 = 2 ft
Side 2 = 3 ft
Side 3 = 10 ft
^^^Plug these values into the formula given above
Perimeter = 2 + 3 + 10
Perimeter = 5 + 10
Perimeter = 15
The perimeter of a triangle with sides 2, 3, and 10 feet is 15 ft
Hope this helped!
~Just a girl in love with Shawn Mendes