Question 146722
picture a right triangle with the right angle resting on the ground


the length of the vertical side of the right angle is 30ft


20ft along the horizontal side (the side on the ground) is the 10 foot object


some distance x (the length of the shadow) beyond the 10 foot object, is the end of the horizontal side


the smaller triangle, with the 10ft vertical side and the x horizontal side is similar to
__ the larger triangle, with the 30ft vertical side and the 20+x horizontal side


10/30=x/(20+x) __ "cross" multiplying __ 200+10x=30x __ 200=20x __ 10=x