How tall is Vicky's dad

A tree 20-feet tall casts a shadow of 15 feet. Vicky's dad casts a shadow 4.5 feet.

This is simply a problem where you need to fill in the missing information. To solve this problem you need the trees shadow, the dads shadow, the trees height, and the dads height. Let's directly compare the tree and the dad: (20ft/15ft shadow) (dads height/4.5ft shadow). Just by comparing the 2, you have set up your problem. Now you are gonne cross multiply. Draw a diagonal line to connect the first problems top number (20ft) to the seconds bottom # (4.5). Multiply them. Now you only have one number left, 15. Divide your answer by 15. Solve all other problems like this the same way. Diagonal line, multiply, divide

First Condition, Tan A = 20/15
Second Condition, Tan A = x /4.5 ( here, x = vicky's dad's height)
So, x /4.5 = 20 / 15
Therefore, x = 6 feet.

her dad is 6 feet