Here's how to make a colorful backyard playhouse (no sewing necessary)
To make a 60-inch-radius halfcircle for the tepee shell, mark a quarter- circle on the folded fabric using a pencil and measuring tape: Lay the measuring tape down between two diagonal corners and draw a 60-inch-long line measured from the folded corner (this is the radius).
Then, starting from the adjacent folded corner, draw a quarter-circle, arcing around the end of the line and ending at the opposite corner.
It may help to mark the curve of the quarter-circle with string secured by pushpins. Cut out the quarter-circle and unfold the fabric.