Question

The length of $4$ sides of a pentagon are $28$ units, $34$ units, $31$ units, and $18$ units. and its perimeter is $130$ units. What is the length of the fifth side?

• A. $20\text{units}$
• B. $111\text{units}$
• C. $241\text{units}$
• D. $19\text{units}$

Answer 1

The correct option is D $19\text{units}$

Perimeter of a pentagon = sum of the length of all $5$ sides of the pentagon
$130=28+34+31+18+$ length of the fifth side
$130=111+$ length of the fifth side
Using the properties of addition and subtraction, we get:
Length of the fifth side $=130-111=19\text{units}$.