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If angle A- Angle B = 63 degree and angle B-angle C = 18 degree. find the measure of the 3 angles of a triangle
We have <A + <B +<C = 1800
<A = 1800 - <B -<C  .....(i)
Given that <A - <B = 630 .......(ii)
and           <B -<C = 1800 ..........(iii)
from (i) and (ii) ,1800 - <B -<C  - <B = 630
ie, 2<B + <C =  1170 ..........(iv)
solving (ii), (iii) and (iv) we get,
<A = 108 <B = 45 and <C  = 27
 


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