Use a calculator to determine the value of arcsin (-0.66).

0.72

2.29

-0.72

-2.29

Arcsin means sin inverse. So we are to find the sin inverse of - 0.66. This can be directly done by using a calculator. Do not forget to change the calculator mode to radians. If the mode of the calculator is degrees the answer will be different.

So, using the calculator arcsin (-0.66) = - 0.7208

Rounding of to nearest hundredth, the answer comes to be - 0.72