BASIC GEOMETRIC FORMULAS AND PROPERTIES（基本几何公式和属性）.pdf
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BASIC GEOMETRIC FORMULAS AND PROPERTIES
This handout is intended as a review of basic geometric formulas and properties. For further or more advanced
geometric formulas and properties, consult with a SLAC counselor.
s
Square:
Perimeter: P = 4s or 2s + 2s s
Area: A = s2
Rectangle:
l
Perimeter: P = 2w + 2l
Area: A = l ×w w
Triangles:
Perimeter: P = a + b + c
Area: A = (1/2) × b × h
a c
h
Types of Triangles:
Isosceles (two equal sides) b
Equilateral (all sides equal)
Right (one 90o or right angle)
A
Pythagorean Theorem (for right triangles only):
2 2 2 c b
a + b = c
B C
Sum of the Angles (all triangles): a
o
A + B + C = 180
Circle: r
Diameter: d = 2r
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