GEOMETRY

• Perimeter of a rectangle

  P = lw
• Area of a rectangle

  A = l × w
• Area of a square?

  A= s²
• Area of a rectangle?

  A=I × w
• Area of a triangle? 

  A = bh/2
• Area of a parallelogram? 

  A=b × h
• Area of a trapezoid? 

  A= 1 / 2 (a+b) h
• Area of a rhombus? 

  A=d¹d²/2
• Area of a sector? 

  A = arc (πr²)/360
• Area of a Equillateral Triangle?

  A= √3(b²)/4
• Perimeter of a rectangle? 

  P= 2L + 2w
• Perimeter of a square?

  P= 4s
• Perimeter of a triangle? 

  P= a + b + c
• Perimeter of a Parallelogram? 

  P= 2a + 2b
• Perimeter of a Trapezoid? 

  P=a + b + c + d
• Perimeter of a Equillateral Triangle? 

  P= 3s
• Perimeter of a sector? 

  P= 2r + arc (c)/360
• Perimeter of a Rhombus? 

  P=4s
• circumference of a circle? 

  C=2πr² or π
• Area of a circle?

  A= πr²
• Area of a sector?

  A= arc (πr²)/360
• Cube Volume

  V = s³
• Cube Surface Area

  SA = 6s²
• Cone Volume

  V = (1/3)πr²h
• Cone Surface Area


  SA = πr√h² + r²
• Cylinder Volume

  V = πr²h
• Cylinder Surface Area

  SA = 2πrh
• Pyramid Volume

  V = (1/3)A × h
• Pyramid Surface Area

  SA = A + √(4A² + 9h²)
• Irregular Prism Volume

  V = A × h
• Sphere Volume

  V = (4/3)πr³
• Sphere Surface Area

  SA = 4πr²
• Enumerate all degree and Radian of a circle!

  1. 30° -> π/6
  2. 45° -> π/4
  3. 60°-> π/3
  4. 90° -> π/2
  5. 120° -> (2/3)π
  6. 135° -> (3/4)π
  7. 150° ->(5/6)π
  8. 180° -> π
  9. 210° -> (7/6)π
  10. 225° -> (5/4)π
  11. 240° -> (4/3)π
  12. 270° -> (3/2)π
  13. 300° -> (5/3)π
  14. 315° -> (7/4)π
  15. 330° -> (11/6)π
  16. 360° -> 2π

  
• sum of Interior < of any polygon:

  (M)interior=180° (n-2)
• sum of measures of exterior < of a regular polygon.

  (M) exterior= 360°
• measure of interior angle of a regular polygon:

  (M) interior= 180° (n-2) / n
• (M)exterior= 360° / n