In the figure below, D is the midpoint of AC, and BD is perpendicular to AC.
What is the length of BD?

Answer:
(BD)^2 + (DC)^2 = (BC)^2
(BD)^2 + (15)^2 = (25)^2
(BD)^2 +225 =625
(BD)^2= 400
BD= 20cm
Step-by-step explanation: