MATH
posted by Amy .
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

B=3A , C=6A1
Sum of angles in triangle is 180°
A+B+C=180°
A+3A+6A1=180
10A1=180,
10A=180+1=181 Divided with 10
A=18.1°
B=3A= 3*18.1=54.3°
C=6A1= 6*18.11=108.61=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´ 
whai is cbd is 70 then what is angle abc is
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