State if each triangle is a right triangle:
2)
13 in
2 in
12 in

Find the center and the radius of the circle with the equation: x^2-2x+y^2+4y+1=0?

Rhombus adef is inscribed into a triangle abc so that they share angle a and the vertex e lies on the side bc . what is the length of the side of the rhombus if ab=c, and ac=b.

3. a sum of $2700 is to be given in the form of 63 prizes. if the prize is of either $100 or $25, find the number of prizes of each type.