Math homework about trigonometry - sine rule.
on a map whose scale is 8 cm to 1 km, an estate is shown as a quadrilateral abcd. the length of the diagonal ac is 7 cm, bâc = 55°, bĉa = 77°, dâc = 90° and dĉa = 40°. (draw the figure)
calculate:
a) the length, in cm, of the side ab on the map;
b) the length, in km, which represented by ad;
c) the area, in km², which represented by δadc.