Duane Bryant
Duane Bryant voted up Mandy Clark's answer
Yes. A quadrilateral has a sum of 360 degrees in its angles. Here's an easy way to remember:

A triangle has 180 degrees as a sum of its angles. Add 180 for each added angle.
Quadrilaterals have 360 degrees
Pentagons have 540 degrees
Hexagons have 620 degrees

And so forth. Hope this helps!
Duane Bryant
Duane Bryant answered Julien Marantes' question
1.  Buy a quality piano, have it delivered and tuned.  2.  Hire the best instructor for beginners you can find.  3.  PRACTICE AT LEAST 8 HOURS A DAY - - - EVERYDAY!!!  4.  As you progress, hire instructors that can keep you improving your talent.  5.  When you're good enough, go to Juilliard.  5.  Start … Read more
Duane Bryant
Duane Bryant answered Confused Girl's question
Area of circle = pi x radius squared  circumference = 2 x diameter  diameter = 2 x radius.  Radius = Square root of (Area/pi) since area is already expressed in terms of pi, take the square root of 121 to find the radius, double that to find the diameter and multiply that by pi to … Read more
Duane Bryant
Duane Bryant answered Jennifer Stevens' question
Impurities in the diamond when forming cause coloration.  It only takes about 1 atom per million diamond lattice atoms.  Boron = blue, nitrogen = yellow, lattice defects = brown, radiation exposure = green.  They also come in purple, pink, orange and red.
Duane Bryant
Duane Bryant answered Aondray Worthy's question
About $1,000 US.  7,000 grains = 1 pound Avoirdupous = 453.59237 grams  Ergo, 7,000/453.59237 = 15.432358352 grains/gram.  33.1 grams x 15.432358352 = 510.811061481 grains.  14kt gold is 14/24 pure (99.999%) gold.  So 14/24 x 510.811061481 = 297.973119197 grains. 1 ounces Troy (scale used to measure precious metals & gems) = 480 grains.  297.973119197/480 = .62077733166 … Read more