Posted by **Amy** on Wednesday, October 27, 2010 at 1:29am.

In a triangle ABC, angle B is three times angle A and angle C is 1 less than 6 times angle A. Find the size of angle A, B, C

- MATH -
**Bosnian**, Wednesday, October 27, 2010 at 2:25am
B=3A , C=6A-1

Sum of angles in triangle is 180°

A+B+C=180°

A+3A+6A-1=180

10A-1=180,

10A=180+1=181 Divided with 10

A=18.1°

B=3A= 3*18.1=54.3°

C=6A-1= 6*18.1-1=108.6-1=107.6°

A=18.1°=18+(0.1*60)= 18° 6´

Besouse 1°= 60´

B=54.3°=54+(0.3*60)= 54° 18´

C=107.6°=107+(0.6*60)= 107° 36´

- MATH -
**kyshia**, Wednesday, April 27, 2011 at 12:44pm
whai is cbd is 70 then what is angle abc is

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