A spider is walking along the strands left on this 3-dimensional figure. Points A and E are are located exactly in the middle of their segments. How many cm did the spider walk if it walked from C, to D, to A, and to B? Round to the nearest tenth. *

Which sum or difference identity would you use to verify that cos (180° - q) = -cos q? a.) sin (a -b) = sin a cos b – cos a sin b b.) cos (a -b) = cos a cos b – sin a sin b c.) cos (a -b) = cos a cosb + sin a sin b d.) sin (a + b) = sin a cos b + cos a sin b