Show that the area of an isosceles triangle with equal sides of length x is A =1/2x^2sin(theta) , where theta is the angle formed by the two equal sides.

Einstein office equipment has a rental plan for office machines. a fax machine that lists for $722.98 can be rented for 22% of the price annually. the state imposes a usage charge of 3.2%. if stephen hawking travel decides to rent the fax machine, what will its total monthly rental charge be?