Find the arc length of AB to the nearest tenth.
90°
B
A
70 m
The arc length is
meters.
                                             
                                          
                                          
                                        
											 
											90 is a fourth of 360, so the a fourth of the total circumference is between those two radii. This means that, if you find the circumference and divide it by 4, the resulting number is that length.