Answer :
we know that the length of an arc is equal to (the angle subtended at the centre)/360 * 2πR.
here length of arc = 8cm. and R = 5 cm. therefore angle subtended = 8*360/(2π*5) = 4*72/π = 91.72 degrees.
here length of arc = 8cm. and R = 5 cm. therefore angle subtended = 8*360/(2π*5) = 4*72/π = 91.72 degrees.