2007-11-02 09:20:46 · 5 answers · asked by Alexander 6 in Science & Mathematics ➔ Mathematics
There are 360° degrees in a circle. 360 was chosen by the ancient Babylonians because 360 can be divided evenly by 2, 3, 4, 6, 8, 9, 10, 12, etc. Plus they had their basis in a base-60 system.
If you draw two perpendicular lines, they divide the circle into 4 quadrants each at right angles. 360° / 4 = 90°
A right angle is 90°
2007-11-02 09:24:24 · answer #1 · answered by Puzzling 7 · 1⤊ 0⤋
90 degrees
2007-11-02 09:28:21 · answer #2 · answered by Simon 5 · 0⤊ 0⤋
90 degrees.
2007-11-02 09:30:10 · answer #3 · answered by Anonymous · 0⤊ 0⤋
ummm, 90. There's no work, friend. It's a definition.
2007-11-02 09:24:11 · answer #4 · answered by Anonymous · 3⤊ 0⤋
and from a level 5...
2007-11-02 09:27:51 · answer #5 · answered by Lord Mavramorn 2 · 2⤊ 0⤋