Question

What is the missing side length of an irregular hexagon with side lengths eleven point seven centimeters, nine point four centimeters, twenty point three centimeters, fifteen centimeters and twenty-one point one centimeters, if the perimeter is equal to the perimeter of a regular pentagon with side length twenty-one centimeters?

six point five centimeters

nine point three centimeters

twenty-seven point five centimeters

forty-eight point five centimeters

Answer 1

the perimeter of the regular pentagon is 5 * 21 = 105cm
so for the irregular hexagon:
11.7+9.4+20.3+15+21+(x)=105
solvin for x you get:
x=105-77.5=27.5cm

Answer 2

thx

Answer 3

no problem