Question

three angles of a quadrilateral are equal to 100°,60°and80° .find its fourth angle​

Answer 1

Answer:

Step-by-step explanation:

360-(100+60+80)=360-240=60

the 4th angle is 60 degrees

Answer 2

Answer:

hi mate

The sum of all angle quadrilateral =360

Since,

angleA +angleB +angleC+angleD =360

so,

100+60+80+x =360

240x =360

x =360-240

x=120

so value the forth angle =120