![\"\"](\"/userfiles/image/steps_images/step1.JPG\")
The perimeter P of a triangle is given by the formula P = a + b + c
\ Where a, b and c are the side lengths of the triangle.![\"\"](\"/userfiles/image/Library/triangle_pa_3_p11.gif\")
![\"\"](\"/userfiles/image/steps_images/step2.JPG\")
The perimeter P of the triangle is
\P = 3.2 cm + 3.2 cm + 1.8 cm (Substitute a = b = 3.2 cm and c = 1.8 cm)
\= 6.4 cm + 1.8 cm (Add 3.2 + 3.2 =6.4)
\ = 8.2 cm (Add 6.4 + 1.8 =8.2) ![\"\"](\"/userfiles/image/steps_images/solution.JPG\")
The perimeter of the triangle is ![\"\"](\"/test/fckeditor/editor/plugins/fckeditor_wiris/integration/showimage.php?formula=bb7dc8275189e79adeddd18e5b90158c.png\")