Posted by **don** on Saturday, August 11, 2012 at 3:44am.

a triangle,side ac is 3/5 of side ab,and is 23.1 m. side ab is 7/9 of side bc.angle b is 1.5 times larger than angle c,and angle a is twice the size of angle c.how many degrees is angle A

- math -
**Steve**, Saturday, August 11, 2012 at 5:46am
ignore all that noise about side lengths. Working with the angles,

b = 3/2 c

a = 2c

a+b+c = 180

2c + 3/2 c + c = 180

9c = 360

c = 40

so,

a = 80

b = 60

you can check on the side lengths of you wish, to make sure they obey the law of sines.

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