Perimeter and Area

Discussion

• Perimeter - the distance around a figure
  • Figures with lines, just add up the sides
  • Square P=4l
  • Rectangle P = 2l + 2w
  • Triangle P = s+s+s
  • Circle P = 2πr
• Area the region within a figure.
  • Area of a rectangle A=l×w
  • Area of a square A=s²
  • Area of a parallelogram A= b×h
  • Area of a triangle A=1/2b×h
  • Area of a circle A=πr²
• The Pythagorean theorem
  • The sum of the squares of the legs of a right triangle is equal to the square of the hypotenuse
  • sideA² + sideB² = hypotenuse²
  • P 499, see side bar. Give a guy a degree, and see what he does.
  • Special 3 4 5 triangle.

Examples

20, 22, 24, 28, 30, 32

Homework