And angle is formed by the union of two vertices or corners.
HOPE I HELPED !
don’t come for me if this is wrong !
KINDEST REGARDS!
2a+b4.....................
Tan(angle) = opposite/adjacent
tan(x) = 90/51
x = arctan(90/51)
x = 60.461217740442
which rounds to 60 when rounding to the nearest whole number
Answer: 60
Let
x--------> the number of blue beads
y--------> the number of red beads
we know that

-------> equation 
------> equation 
equate equation
and equation 

find the value of x

therefore
the answer is
Ivan has

I think it will be a solution. Hope it help!