If you want to calculate the perimeter of an irregular trapezoid, there's no special formula - just add all four sides:
Trapezoid perimeter = a + b + c + d
Maybe you've noticed, but it's the formula for any quadrilateral perimeter.
There's also an option that that presents itself with certain special trapezoids - like an isosceles trapezoid, where you need a, b, and c sides. Another example is a right trapezoid, where the length of the bases and one leg are enough to find the shape's perimeter (the last leg is calculated using Pythagoras' Theorem).
We call two numbers a and b, notice a>b <span>The sum of two numbers is 110: a+b=110 </span><span>The larger number is 2 less than 7 times the smaller: a=7b-2 And by replacing a=7b-2 we have an equation: 7b-2+b=110 or 8b=110+2, and 8b=112, that means b=112:8= 14
