one fourth of circle
A full circle is 360o, so a quarter, (one fourth) of a circle is 90o.
The arc is one quarter of a circle so is 2pir, the other components of the quarter circle are the two radii, so perimeter is 2r+2pir = 2r(1+pi)
Half circle plus quarter circle is equal to three-fourths of a circle. Three-fourths of a circle plus one eighth of a circle is seven-eighths. You still need one more eighth to complete the circle.
1/4 of a circle is a 90 degree turn
First quarter. Second quarter. Third quarter. Fourth quarter. Circle center.
I'm guessing a quarter of a rotation of a circle would be 90 degrees (360/4) so two times would be.. 180? :)
A quarter of a circle is a turn of 90 degrees'
There are 90 degrees
A quarter of the way around a circle would be 90 degrees or pi/2 radians.
about 500,000 viruses
13 m