Question

find the value of x ​

Answer 1

Answer:x=50°

Step-by-step explanation:

(x+3)+(x+20)+(x+7)=180°. {Being sum of angles of a straight line}

Or, 3x+30°=180°

Or, 3x=(180-30)°=150°

Or,x=(150/3)°=50°

Answer 2

We know that

Sum of all angles given on straight line =180°{means linear pair}

(x+3)+(x+20)+(x+7)=180°{Linear pair}

x+3+x+20+x+7=180°

3x+30=180°

3x=180°-30

3x=150

x=150/3

x=50°

so,

x+3=50+3=53°

x+20=50+20=70°

x+7=50+7=57°

Proof

53°+70°+57°

=180°