Answer:
90 degree
Step-by-step explanation:
We start with SWV as right angle and isosceles can be found to find W
SWV = 90 so we know as isosceles they all are 90 degree met with 45 degree at line of intersections.
We see a right angle at point S on SWT and make a right angle triangle at SWT, to find T angle equal to S=90 W=45 T=45
So SWT = SRT = SRW = TRV
The middle points with R in them are all 90 at point R
The others are 90 at point S on TSW (SWT) and on all outside perimeters for the larger triangles.
