Title: Leaning Tower of Pisa
Content:  The Leaning Tower of Pisa (torre pendente di Pisa), or simply the Tower of Pisa (torre di Pisa ), is the campanile, or freestanding bell tower, of the cathedral of the Italian city of Pisa, known worldwide for its nearly four-degree lean, the result of an unstable foundation. The tower is situated behind the Pisa Cathedral and is the third-oldest structure in the city's Cathedral Square (Piazza del Duomo), after the cathedral and the Pisa Baptistry. The height of the tower is 55.86 m from the ground on the low side and 56.67 m on the high side. The width of the walls at the base is 2.44 m. Its weight is estimated at 14500 t. The tower has 296 or 294 steps; the seventh floor has two fewer steps on the north-facing staircase. The tower began to lean during construction in the 12th century, due to soft ground which could not properly support the structure's weight, and it worsened through the completion of construction in the 14th century. By 1990, the tilt had reached 5.5 degrees. The structure was stabilized by remedial work between 1993 and 2001, which reduced the tilt to 3.97 degrees.
Title: Phallic architecture
Content:  The Leaning Tower of Pisa in Pisa, Italy, dating from around 1173, has long suffered from structural problems. The tower is eight stories high at 55.86 m and before restoration work from 1990 leaned 5.5 degrees. It currently leans about 4 degrees but due to foundation problems it continues to sink about 1mm annually. The resemblance of the tower to a penis has seen the "Leaning Tower of Pisa" become a sexual slang term for a half erect penis.
Title: Leaning Tower of Pisa
Content: Elevation of Piazza del Duomo: about 2 metres (6 feet, DMS) ; Height from the ground floor: 55.863 m, 8 stories ; Height from the foundation floor: 58.36 m ; Outer diameter of base: 15.484 m ; Inner diameter of base: 7.368 m ; Angle of slant: 3.97 degrees or 3.9 m from the vertical ; Weight: 14700 metric ton ; Thickness of walls at the base: 2.44 m ; Total number of bells: 7, tuned to musical scale, clockwise: ; 1st bell: L'Assunta, cast in 1654 by Giovanni Pietro Orlandi, weight 3620 kg ; 2nd bell: Il Crocifisso, cast in 1572 by Vincenzo Possenti, weight 2462 kg ; 3rd bell: San Ranieri, cast in 
Title: Leaning Tower of Pisa
Content:  Two German churches have challenged the tower's status as the world's most lopsided building: the 15th-century square Leaning Tower of Suurhusen and the 14th-century bell tower in the town of Bad Frankenhausen. Guinness World Records measured the Pisa and Suurhusen towers, finding the former's tilt to be 3.97 degrees. In June 2010, Guinness World Records certified the Capital Gate building in Abu Dhabi, UAE as the "World's Furthest Leaning Man-made Tower"; it has an 18-degree slope, almost five times more than the Pisa Tower, but was deliberately engineered to slant. The Leaning Tower of Wanaka in New Zealand, also deliberately built, leans at 53 degrees to the ground.
Title: Leaning Tower of Pisa
Content:  tower, was impressed by the beauty of the cathedral and its campanile, and thus refrained from ordering an artillery strike, sparing it from destruction. Numerous efforts have been made to restore the tower to a vertical orientation or at least keep it from falling over. Most of these efforts failed; some worsened the tilt. On 27 February 1964, the government of Italy requested aid in preventing the tower from toppling. It was, however, considered important to retain the current tilt, due to the role that this element played in promoting the tourism industry of Pisa. Starting in 1993, 870 tonnes of lead counterweights were added, which straightened the tower slightly. The tower and the neighbouring cathedral, baptistery, and cemetery are included 
Title: Piazza dei Miracoli
Content:  in 2004, weight 652 kg (1,437 lb) The campanile (bell tower), commonly known as the Leaning Tower of Pisa, is located behind the cathedral. The last of the three major buildings on the piazza to be built, construction of the bell tower began in 1173 and took place in three stages over the course of 177 years, with the bell-chamber only added in 1372. Five years after construction began, when the building had reached the third floor level, the weak subsoil and poor foundation led to the building sinking on its south side. The building was left for a century, which allowed the subsoil to stabilise itself and prevented the building from 
Title: Leaning Tower of Pisa
Content:  Vergata in Palazzo Pretorio in Pisa, where it was called La Giustizia (The Justice). The bell was tolled to announce executions of criminals and traitors, including Count Ugolino in 1289. A new bell was installed in the bell tower at the end of the 18th century to replace the broken Pasquareccia. The circular shape and great height of the campanile were unusual for their time, and the crowning belfry is stylistically distinct from the rest of the construction. This belfry incorporates a 14 cm correction for the inclined axis below. The siting of the campanile within the Piazza del Duomo diverges from the axial alignment of the cathedral and baptistery of the Piazza del Duomo.
Title: Leaning Tower of Pisa
Content:  to compensate for the tilt, the engineers built upper floors with one side taller than the other. Because of this, the tower is curved. Construction was halted again in 1284 when the Pisans were defeated by the Genoese in the Battle of Meloria. The seventh floor was completed in 1319. The bell-chamber was finally added in 1372. It was built by Tommaso di Andrea Pisano, who succeeded in harmonizing the Gothic elements of the belfry with the Romanesque style of the tower. There are seven bells, one for each note of the musical major scale. The largest one was installed in 1655. 
Title: Abu Dhabi National Exhibitions Company
Content:  Records certified Capital Gate as the "World's furthest leaning man-made tower." The new record shows that the Capital Gate tower has been built to lean 18 degrees westwards; more than four times that of the world-famous Leaning Tower of Pisa. Investigation and evaluation, which was made by a Guinness appointed awards committee, started in January 2010, when the exterior of the 160-metre (524.9 ft), 35-storey tower was completed. The Capital Gate project was able to achieve its record inclination through a special engineering breakthrough that allows floor plates to be stacked vertically up to the 12th storey and staggered over each other by between 300 mm and 1,400 mm, which allows for the tower's dramatic 
Title: Diotisalvi
Content:  Recent studies attribute by analogies also the famous Leaning Tower of Pisa (1173) to magister Diotisalvi. The shape, the construction, the affinity with the belltower of St. Nicholas all bring to mind the work of Diotisalvi. Like the Baptistery, the tower wasn't completed by him, maybe, just like the Baptistery, was Giovanni Pisano the last architect. That should explain why there is no pyramidal roof like all the other buildings

Question: what is the angle of the tower of pisa?
Answer: about 3.99 degrees.
3.99 degrees.
at about 3.99 degrees.