Question

The ratio of angles of triangle 3:4:5 the three angles of a quadilateral is equal to threee angles of this triangle

Answer 1

Hiii,
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The sum of all the angles of an triangle are 180°.
 3x+4x+5x= 180
12x = 180
x= 15 
then,
     3x = 45 °
     4x = 60°
     5x = 75°
    then sum of all angles of quadrilateral are 360°
    45°+60°+75°+x=360°
      x = 360°-180°
      x = 180°
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ANKIT