1. ratio of corresponding sides of similar triangles is 4:9, ratio of the area of the smaller to the larger triangle is?
2. measure of each exterior angle of a regular polygon is 20 degrees, how many sides does the polygon have.
3. a set has a scalene, isosoles, and an equilateral triangle...select one at random, what is the probability that at leastone of its medians is also an altitude?