One side of the triangle is 12 cm, it is 4 cm more than the second side and 3 cm more than the third

One side of the triangle is 12 cm, it is 4 cm more than the second side and 3 cm more than the third. Calculate the perimeter of this triangle.

1 side – 12 cm
2nd side -? cm, 4 cm less than (show with an arrow on 1 side)
3rd side -? cm, 3 cm less than (show with an arrow on 1 side)
P triangle -? cm

Solution:
1) 12 – 4 = 8 (cm) – 2 side of the triangle
2) 12 – 3 = 9 (cm) – 3 side of the triangle
P = a + b + c
P = 12 cm + 8 cm + 9 cm
P = 29 cm

Answer: The perimeter of the triangle is 29 centimeters.