Question

in a triangle ABC, 2A + 2B= 65 and 28+ 2C 140, find all the angles.​

Answer 1

Answer:

∠A+∠B=65 −−−(1)

∠A+∠C=140   −−−(2)

we know ∠A+∠B+∠C=180degree

 

from (1)65  +∠C=180degree  

from (2) ∠C=115  

 

​ from (2)

∠A+∠C=140

∠A+25=65  

∠A=40degree

 from (1)∠A+∠B=65  

∠B=25degree