Monday

September 1, 2014

September 1, 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.

**Related Questions**

11th grade - Angle QRS is a straight angle. If a=2c, c=2b, and b=d/3, what are ...

math - using a ruler and a pair of compass only construct a quadrilateral PQRS...

MATHH - In a triangle ABC, angle A is 2 times angles C and angle B is 20 degrees...

Geometry - Given: in triangle ABC, angle B= 120 degrees Prove: angle A does not...

MATH - ABCD is a quadrilateral in which AB parallel DC and AD=BC.prove that (1)...

math - ABCD is a quadrilateral in which AB parallel DC and AD=BC.prove that (1)...

MATH PLEASE - can a reference angle be negative? Tye "reference angle" in google...

6th grade - a 180 degrees angle is sometimes called a straight angle.Explain why...

math - The measure of an interior angle of a regular polygon is 135 degrees. ...

basic geometric - a would like to get someone too help me with these math ...