This is technically impossible to answer as the M25 is not a complete circle - it is a C shape: the Dartford crossing is actually an A road (the A282).
However, ignoring this [obscure fact], a full lap of the M25 plus Dartford crossing is approx 118 miles in length, and assuming it to be a circle, its area would be approx 1100 sq miles - as the M25 wiggles quite a bit, the area is slightly less than this.
It is inside the M25.
117 miles.
54 miles following M25.
95 miles taking this route:Take A1 to the SOUTH from Peterborough to M25 towards HEATHROW (airport).Take M25 to Heathrow.
60 miles taking this route:Go to M25 via A13; once you are at M25, follow signs to M25 STANSTED AIRPORT (to M11).Take M25 around to M11 CAMBRIDGE at J27.Take M11 up to Cambridge.
The M25 is Approximately 118 Miles long.
About 84 miles on the M25 and A21
63 miles taking this route:Take M3 LONDON from Southampton to M25 at JUNCTION 2. Follow signs to M25 HEATHROW airport.Follow M25 to Heathrow Airport. Follow signs to your terminal.
90 miles taking this route:Take A264 from Horsham to M25 via M23. Once you are at M25, follow signs to M25 to MAIDSTONE (via M20).Take M25 to M20 to DOVER via M26 at J5.Take M20 & A20 to Dover.
the M25 is reported to be 117 miles long , so if it was a circle the area can be calculated C = 2 pie R where c is circumference and R the radius so R = 117/2 Pie = 18.6 miles approx so the area A = pie R squared A=1087 miles if it was a circle which it isnt so i would take away somewhere between 5 and 15 per cent 5% of 1087 = about 54 15% about 162 so about 925 - 1033 square miles , although ive read somewhere its only about 600 square miles so maybe my maths is a bit dodgy when im drunk
The diameter of the M25 fluctuates between 24 and 40 miles but its circumference is 117 miles.
It is known as the M25 or the London Orbital and is 117 miles long