prove that BCDF is a parallelogram in triangle AED and triangle EFC if given that D ​ and E are the midpoints of AB and AC respectively​

Monica build a remote control toy airplane for science project to test the plane she launched it from the top of a building the plane travel a horizontal distance of 50 feet before landing on the ground a quadratic function which models the height of the plane in feet relative to the ground at a horizontal distance of x feet from the building is shown

Acylinder and its dimensions are shown. which equation can be used to find v, the volume of the cylinder in cubic centimeters?

In the diagram below,abc is congruent to dec what is the value of x