Question

A 0.80 m wide door turns though an angle of 45°. How long is the arc of the displacement?

O 1.0 m
O 0.80 m
O 0.63 m
O 0.45 m

Answer 1

below

Step-by-step explanation:

If it went for 360° it would swing through the ENTIRE circumference = 2 pi r

= 2 pi ( .8 ) =5.026 m

but it only swings through 45 of the 360

45 / 360 * 5.026 = .63 m