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Solution to Outside the pentagon II using reflection symmetry and the inscribed angle theorem.

Solving the beginner puzzle Triangulation using a dissection of the dodecagon.

Solution of The beach ball using properties of the dodecagon.

Solution to Pentagon pleasure II using two similar triangles.

Solving Secured package using to hidden circles.

Video solution to Cramped space using the radical axis.

Solving Miniaturisation using similarity.

Solving Blocking the view using 90-degree rotational symmetry.

Solution for The leaning diamond using congruent triangles.

Solution to Siamese triplet III using Siamese triplet II and isosceles trapeziums.

Solution to Pushed together using symmetry and parallel lines.

Solving The helmet visor with two circles.

The blue lagoon

Wheel in motion

Solution to Ice cream cone II using dilation.

Solving Pentagon offspring II using two isosceles triangles.

Mother's umbrella II

All connected

Carom biliards

Ten to nine

The Siamese triplet

Tweezers

A devious cevian

Distant Alp II

Locus pocus

Family constellation

Man in the middle

Four five

Consecutive numbers