If you want to remember the formulas for the perimeter and area of basic shapes quickly, making flashcards can really help. Here’s a simple guide for each shape:

• Square:

  • Perimeter: Add up all the sides: ( P = 4s )
  • Area: Multiply one side by itself: ( A = s^2 )

• Rectangle:

  • Perimeter: Add up the length and width, then double it: ( P = 2(l+w) )
  • Area: Multiply the length by the width: ( A = l \cdot w )

• Triangle:

  • Perimeter: Add the lengths of all three sides: ( P = a + b + c )
  • Area: Take half of the base times the height: ( A = \frac{1}{2}bh )

• Circle:

  • Circumference (the distance around): Multiply 2 by pi (about 3.14) and the radius: ( C = 2\pi r )
  • Area: Multiply pi by the radius squared: ( A = \pi r^2 )

If you review these often, you’ll remember them in no time!