You have to use the Pythagorean Theorem to find the perimeter of triangle ABC.
The heights is 6 units and the base is 5 units.
A^2 + B^2 = C^2
(6)^2 + (5)^2 = C^2
36 + 25 = C^2
61 = C^2
= C
The perimeter would be 6 + 5 +
= 11 +
units
The answer is asking for the nearest tenth so
= 7.8
P = 11 + 7.8 = 18.8 units