Question

three angles of a quadrilateral are equal and it fourth side is right angle​

Answer 1

Answer:90 degrees.

Step-by-step explanation:The three angles are equal, let each be equal to x. Therefore the sum of the three angles is 3x. x = 90 degrees. That means all the angles of this quadrilateral are 90 degrees.

Answer 2

Answer:

Let three equal angles be x, x and x.

x+x+x+90=360

3x=360-90

3x=270

x=270/3

x=90

Hence,the three equal angles is 90,90and 90