Find the period of swinging semi-cycle and triangle when they are hanging two ways.

compare the calculation value, T 1=0.627 s which is not quite close the measurement value 0.728 s 

T 2 =0.731 s is a good prediction because the measurement value is 0.737 s .

compare with calculation value T=0.771 s less than 1% mistake.

compare with calculation value T=0.737 s less than 1% mistake.