Question

i a quadrilateral ABCD ,A=90°,B=90°,and C=100°. find D​

Answer 1

we know sum of all angles of quadrilateral is 360°

so A+B+C+D=360°

and 90+90+100+D =360°

= 280+D =360°

D = 80°

Answer 2

hey friend

we know that ,

the sum of all angle of a quadilateral is 360

then angle D

360 - 90 -90-100= D

D = 360 - 280

D = 80