Question

Find the measure of x if angles of a quadrilateral are 90⁰,80⁰,70⁰,x *​

Answer 1

Answer:

$\sf \ \: x + 90 + 80 + 70 = 360 \\ \sf240 + x = 360 \\ \sf \:x = 360 - 240 \\ \sf \: x = 120$

Answer 2

Answer:

90°+80°+70°+x=360°

=>240°+x=360°

=>x=360°-240°

=>x=120°