Police say Kelsie Schmidt sent the X-rated images to a 17-year-old student at Beulah High School in North Dakota last August.
According to court documents, Schmidt was arrested on January 23 after a student told a detective “that he could get the math teacher in trouble for pictures that she had sent him”.
Her resignation was formerly accepted two days later.
The student was interviewed after reports that a teacher had been sending nude photos on Snapchat.
NAKED FROM THE WAIST UP
One was reportedly a picture of the teacher, naked from the waist up, with her hair partly covering her breasts.
Another photo was allegedly of the teacher’s legs with the message "get a group and play naked hide and seek," The Dickinson Press reports.
Police allege the teacher sent three or four photos in total.
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Rookie maths teacher, 24, ‘sent boy nude Snapchat selfies and asked him to play naked hide and seek with a group of pals’