Durtles

@makeaproblem.bsky.social

90 Followers 61 Following

Math book author and problem collector. Books: https://dandelioneducation.ca/books/ Snail Mail Club: https://ko-fi.com/makeaproblem/tiers/ YouTube: https://www.youtube.com/@MakeaProblem

So I'm starting a snail mail club for math people, with a math problem, instructions for a matching doodling game, and other related goodies in the mail each month.
A sphere with center at Point A, and Point B is the midpoint of a radius.
A circle with radii OC and OD that are perpendicular to each other. Point A is the midpoint of OC, and point B is on OD but closer to O than to D.
A circle with radius OC and OD that are perpendicular to each other. Point B is the midpoint of OD, and point E is the midpoint of OC. Point A is placed such that ABOE is a square.
A circle with radius OC and points A and B are on OC, dividing it into thirds.
a circle with horizontal diameter CD. Point A is on CD and to the left of the center, and point B is on CD to the right of the center.
a circle with point A at the center and point B halfway between point A and the circumference of the circle.
Two green houses and two blue houses. The blue houses are mirror images of the green house, and the second pair of green and blue houses are horizontal stretches of the first pair.
A green house shape and an identical blue house shape moved half the shape's width to the right.
A green house shape with a smaller blue house shape that's turned 45 degrees counter-clockwise and moved to the right.
a large blue house shape and a smaller green house shape that's the blue house rotated half way around the circle.
A large blue house shape with a smaller green version of the same house shape inside.
A long blank equals 81.
On one line, 7 spaces added together to equal 14. On the second line, 4 spaces added together to equal 14.
Three cubes arranged in an L shape with two in the front row and one in the back row on the right. Two green dots mark the front bottom left corner of the front row and the back top right corner of the back row.
Four diagonally connected squares, with two in the top row, both connected to the one in the second row, which is connected to the square in the bottom left. Two green dots mark the bottom left and top right corners of the grid.
a 2 by 3 square grid with the top left and bottom right square missing, a green dot on each of the bottom left corner and top right corner.
a 2 by 2 square grid with green points on the bottom left and top right corners