Fie trapezul abcd dreptunghic in a, bc||ad, cd=12, m unghiului bcd=60°, bc=2ad. a) aratati ca perimetrul trapezului abcd este egal cu 6(5+radical din 3) cm. b)calculati aria lui abcd. c)aflati sinusul unghiului bca

first one is a: renaming a fraction. second one is c: de-c

step-by-step explanation:

my explanation is that these were the answers on edg : )

you can't solve x because it is 2 linear equation and you only have one equation

step-by-step explanation:

no, her answer is not correct.   we square the lengths of all sides and then determine whether the pythagorean theorem holds here:

9² + 15² = 306.   this is not equal to the square of the longest side ( that square being 395.   answer c is correct.