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April 19, 2014

April 19, 2014

Posted by **Donny** on Tuesday, January 12, 2010 at 10:38pm.

- Math -
**drwls**, Tuesday, January 12, 2010 at 11:49pmYou have 4 equations in 4 unknowns. Use substitution to reduce the number of variables.

2c + c/2 + c + 3b = 7c/2 + 3c/2 = 5c = 180

c = 180/5 = 36 degrees

a = 2c = 72

b = c/2 = 18

d = 3b = 54

They add up to 180, as required.

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