Question

Find the perimeter of a triangle where one side is 3cm , one side is 9cm and one side is 12cm

(a) 12cm
(b) 6cm
(c) 4cm
(d) 24cm​

Answer 1

(d) 24 cm

Explanation:

When we're given the three sides of a triangle, one formula we can use for perimeter of a triangle is:

P = s1 + s2 + s3, where

• P is the perimeter,
• and s1, s2, and s3 are the three sides:

P = 3 + 9 + 12

P = 12 + 12

P = 24

Thus, the perimeter of the triangle is 24 cm