This document provides formulas for calculating the perimeter and area of basic geometric shapes including squares, rectangles, parallelograms, and triangles. It gives the perimeter formula of P=4s for squares, P=2l+2w for rectangles, P=2b+2s for parallelograms, and P=s1+s2+s3 for triangles. The area formulas are provided as A=s^2 for squares, A=lw for rectangles, A=bh for parallelograms, and A=1/2bh for triangles. Examples of each shape are shown with the dimensions and calculations.

1. Geometric Formulas

2. PERIMETER
OF A
SQUARE
P= 4s

3. AREA OF A
SQUARE
A=s
2

4. 3 in.
3 in.
Area of a Square
A=s
A= 3 in.x3 in.
A=9 sq. in.
Perimeter of a Square
P=4s
P=4(3 in.)
P=12 in.
2

5. PERIMETER OF A
RECTANGLE
P=2l+2w

6. AREA OF A
RECTANGLE
A=lw

7. 2 in.
3 in.
Perimeter of a Rectangle
P=2l+2w
P=2(3 in.) + 2 (2in.)
P=6 in. + 4 in.
P=10 in.
Area of a Rectangle
A=lw
A=3 in.(2 in.)
A=6sq. in.

8. PERIMETER OF A
PARALLELOGRAM
P=2b+2s

9. AREA OF A
PARALLELOGRAM
A=bh

10. Perimeter of a Parallelogram
P=2b+2s
P=2(2 in.) + 2(3in.)
P= 4 in. + 6 in.
P= 10 in.
2 in.
3 in.
Area of a
Parallelogram
A=bh
A= 2 in.(3 in.)
A= 6 sq. in.

11. PERIMETER OF A
TRIANGLE
P=s +s +s
1 2 3

12. AREA OF A
TRIANGLE
A=1/2bh

13. Perimeter of a
Triangle
P=s + s + s
1 2 3
P=4cm+4cm+4cm
P= 12 cm
4cm
4cm
4cm
Area of a Triangle
A= 1/2bh
A=1/2(4cm x 4cm)
A= ½(16cm)
A= 8 sq. cm.