Question

the three angles of a quadrilateral are 65 degree 75 degrees 80 degrees the fourth angle is​

Answer 1

Answer:

140 DEGREE

Step-by-step explanation:

65 DEGREE+75 DEGREE+80 DEGREE+FOURTH ANGLE=360 DEGREE

(ANGLE SUM PROPERTY OF A QUADRILATERAL EQUALS 360 DEGREE)

220+ 4TH ANGLE=360 DEGREE

4TH ANGLE=360-220

4TH ANGLE=140 DEGREE

Answer 2

Answer:

Let the fourth be x.

Sum of angles of a quadrilateral = 360°

65° + 75° + 80°+ x = 360°

220° + x = 360°

x = 360° - 220°

x = 140°