There are 3 consecutive traffic lights which turns green after 36,42 and 72 sec. They all were green at 9:00am. At what time all turn green simultaneously.
There are 3 consecutive traffic lights which turns green after 36,42 and 72 sec. They all were green at 9:00am. At what time all turn green simultaneously.
O is a point in the interior of a triangle abc,od perpendicular bc,oe perpendicular ac and of perpendicular ab. Show that 1.oa^2+ob^2+oc^2-od^2-oe^2-of^2 =af^2 +bd^2+ce^2