Question

calculate the angles marked with small leters in the following figure ​

Answer 1

angle o=120 (v. o. A)

angle p, q, r, s =90 as it is a rectangle

and diagonals bisect each other

so. angle RSO=b

in triangle SOR

b+b+120= 180

2b=60

b=30

angle R= 90=a+b

a=90_30

a=60