Question

A quadrilateral has three acute angles,each measuring 80°.Find d measure of the fourth angle ans fast plz

Answer 1

we know that ,
sum of quadilateral is 360
therefore,
80+80+80+d=360
d=360-240
d = 120

Answer 2

We know that all the angles of a quadrilateral=360°

Three angles of quadrilateral=80°+80°+80°=240°(Given)

then to find fourth angle,
Let the fourth angle be x,

=> Sum of three angles + fourth angle= 360°
=> 240°+x=360°
=> x=(360-240)°
=>x=120°
hence the fourth angle=x=120°

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