A bright light object appearing to be the size of a house moving across the sky, making an abrupt triangle shape in the sky and leaving

We watched what was thought to be a star at first slowly move across the sky. As it got closer to us the size of the object became noticeably larger. It was a like a large light moving in the sky. The object came to an a brupt stop and we watched it for what seemed like three or four minutes. The object then moved at a super speed forming the shape of a triange in the sky. It repeated this move three times, sat still for a moment and then shot across the sky making a white streak across the sky.
No aircraft we have can move in a manner as to stop and go from point A to B and to C making a triangle shape in the sky.
A military jet came over towards where the object was after it left, followed by a helicopter. The object was gone by this time.
Witness indicates that the date of the sighting is approximate.  PD