Find the perimeter of triangle ABC, Find the perimeter of triangle ABC if AB = 2.8 cm

Find the perimeter of triangle ABC, Find the perimeter of triangle ABC if AB = 2.8 cm, and BC is more than AB by 0.8 cm, but less than AC by 1.1 cm.

1) Find the length of the BC side. If it is 0.8 cm longer than the AB side, then it is necessary to add 0.8 cm to the length of the AB side.

2.8 + 0.8 = 3.6 (cm).

2) Find the length of the AC side. If the BC side is 1.1 cm less than the AC side, then the AC side, on the contrary, is 1.1 cm larger than the BC side.

3.6 + 1.1 = 4.7 (cm).

3) Find the perimeter of the triangle ABC. The perimeter of a triangle is equal to the sum of the lengths of all three of its sides AB, BC and AC. P = AB + BC + AC.

P = 2.8 + 3.6 + 4.7 = 11.1 (cm).

Answer. 11.1 cm.