The length of member DC in the figure below is 60 mm. Determine the angle d O A O B. OE where. [(20 mm) sin 1151 AB AB= 202 + 602 sin SO D. in 65% [(20 mm) sin 65% AB where, AB 20 + 60-2(20)(60) cos 65 mm = sin [(201 sin-1 = sin where, AB 20 +60 AB sin 115 60 mm where, AB= 20 +60 + 2(20)(60) cos 115 mm 2(20) (60) cos 115 mm sin-1 [(60 mm) sin 651 AB AB sin 65 60 mm 2(20)(60) cos 65 mm where, AB 20 + 60 +2(20)(60) cos 65 mm 20 mm 65