Angel is a London Underground station in the Angel area of the London Borough of Islington. It is on the Bank branch of the Northern line, between King's Cross St. Pancras and Old Street stations, in Travelcard Zone 1.
Hyde Park Corner is a London Underground station near Hyde Park Corner in Hyde Park. It is in Travelcard Zone 1, between Knightsbridge and Green Park on the Piccadilly line.
Tourists normally use zone 1 where most of the tourist attractions are located, along with a lot of the popular hotel districts. Some of London's trendy neighbourhoods like Camden and Notting Hill are located in Zone 2.
Zone 1 is considered the target range for warm-up and recovery work and should be about 50-60% of your heart rate (HR) max. Zone 2 is considered the target range for aerobic and base fitness work and should be about 60-70% of your HRmax.
Zone 1 – basic level: When your heart beats at 50-60% of your maximum heart rate while exercising for between 20–40 minutes, this activity is referred to as light exercise. Examples include jogging, brisk walking, cycling or walking on a treadmill, all of which will help increase blood flow around the body.
The avoiding zone 1 fare is defined by changing between the Overground and Underground at Camden Road/Town. However, due to limitations in the way interchanges are stored on the Oyster system it also works if you change at Clapham High Street/North.
While Chelsea doesn't have its own tube station, the closest stations are only a short walk from the area – these are Sloane Square on the District and Circle lines and South Kensington on the District, Circle and Piccadilly lines. Both are in Travelcard Zone 1.
Greenwich and Cutty Sark stations are in both zones 2 and 3. A travelcard for zones 1 and 2 will take you from central London to Greenwich by any rail or bus route. to explain a bit - there are a few places that are in more than one zone.