Answers

2015-06-10T07:03:46+05:30
X + y +40° = 180°
or, x + y = 140
°

Again, x - y = 30
°

So, 2x = 170
°
or, x = 85
°
So, y = 140
° - 85° =55°
0
2015-06-10T08:27:38+05:30
Given that the angles of a triangle are x , y , 40⁰
We know that , sum of all angles of a triangle = 180⁰
⇒x+y+40⁰ = 180⁰
⇒x+y = 180⁰ - 40⁰ = 140⁰
Given that x-y = 30⁰
⇒x+y = 140⁰
   x-y  =  30⁰
⇒ 2x = 170⁰
⇒  x = 85⁰
Now , y = ?
⇒ x+y = 140⁰
⇒85⁰+y = 140⁰
⇒ y = 140⁰ - 85⁰
⇒ y = 55⁰

Check : x+y = 140⁰
          ⇒85⁰+55⁰ = 140⁰
          ⇒140⁰ = 140⁰
Therefore , L.H.S = R.H.S .
0