Question

1. the perimeter of the triangle is 55cm. solve for x. 18cm 20cm x =

Explanation:

Step1: Recall perimeter formula

The perimeter $P$ of a triangle is $P=a + b+ c$, where $a$, $b$, and $c$ are the side - lengths. Here, $P = 55$ cm, $a = 18$ cm, $b = 20$ cm, and $c=x$. So, $55=18 + 20+x$.

Step2: Simplify the right - hand side

First, add 18 and 20: $18 + 20=38$. The equation becomes $55=38 + x$.

Step3: Solve for $x$

Subtract 38 from both sides of the equation: $x=55 - 38$.
$x = 17$

Answer:

$17$