16 presidents by order
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Explanation:

George Washington (1789–1797)

John Adams (1797–1801)

Thomas Jefferson (1801–1809)

James Madison (1809–1817)

James Monroe (1817–1825)

John Quincy Adams (1825–1829)

Andrew Jackson (1829–1837)

Martin Van Buren (1837–1841)

William Henry Harrison (1841)

John Tyler (1841–1845)

James K. Polk (1845–1849)

Zachary Taylor (1849–1850)

Millard Fillmore (1850–1853)

Franklin Pierce (1853–1857)

James Buchanan (1857–1861)

Abraham Lincoln (1861–1865)

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George Washington, the 1st President of the United States

  John Adams, the 2nd President of the United States

 Thomas Jefferson, the 3rd President of the United States

 James Madison, the 4th President of the United States

James Monroe, the 5th President of the United States

John Quincy Adams, the 6th President of the United States

Andrew Jackson, the 7th President of the United States

Martin Van Buren, the 8th President of the United States

William Henry Harrison, the 9th President of the United States

John Tyler, the 10th President of the United States

James K. Polk, the 11th President of the United States

Zachary Taylor  THE 12TH PRESIDENT OF THE UNITED STATES

 Millard Fillmore, the 13th President of the United States

Franklin Pierce, the 14th President of the United States

James Buchanan, the 15th President of the United States

 Abraham Lincoln, the 16th President of the United States

half of a circle

explanation:

the arrow and the top of the circle is matching together. it is not a polygon because a polygon would always be the same shape. therefore, an half of a circle is called semicircle so you would find the radius of it.

the average speed is 24.57 km/hr