Hi. I've just got 20 math tasks that I need to solve until saturday. I don't know how to solve 4. Pls help. P. S. My english is not very good, sorry about that..

1. Man and woman are standing on the street. A man is tall 188 cm and his shadow is tall 1 m (100cm).. How tall is the woman if her shadow is 80 cm tall.

2. Area (surface) of similar triangels is 8cm2 and 18cm2. If extent (perimeter) of bigget triangle is 20cm, what's the extent (perimeter) of smaller triangle?

3. a= 28 cm, b = 52/3 cm, c = 80/3 cm. What's the radius of circular of his similar triangle if his extent (perimeter) is 126 cm2

4. In right-angeled triangle p = 3cm v = 4 cm. calculate a, b, c. (p=extent (perimeter) and v=height of the triangle)