Answer:160mStep-by-step explanation:The perimter of a rhombus is just its four sides added together, and all of those sides are equal so the formula will be P=4s where "P" indicates the perimeter and "s" for the sides. We know thay the measurement of all its sides is 40m, so we can replace "s" with this number.P=4s; s=40P=4(40)P=160Don't forget the unit used with the sides– the final answer is 160m