Categories
Premium

Video: Wheel in motion

You need to be logged in to view this content. Please . Not a Member? Join Us
Categories
Advanced

Tweezers

A square with two semicircles. The smaller one has an extended diameter and a tangent. What are the coordinates of the tangency point?

Categories
Premium

Video: Similar but different

You need to be logged in to view this content. Please . Not a Member? Join Us
Categories
Intermediate

Stand behind

Two regular hexagons share a vertex. Prove that the blue points are collinear.

Categories
Beginner

The blue lagoon

Five congruent brown triangles inside a rectangle. What fraction is brown?

Categories
Premium

Video: Mother’s umbrella II

You need to be logged in to view this content. Please . Not a Member? Join Us
Categories
Premium

Video: Distant Alp II

You need to be logged in to view this content. Please . Not a Member? Join Us
Categories
Advanced

Wheel in motion

A circle with its centre and two squares sharing a vertex. What’s the angle α?

Categories
Premium

Video: Rectangle offspring

You need to be logged in to view this content. Please . Not a Member? Join Us
Categories
Intermediate

Similar but different

Four similar triangles make up a large triangle. Express red in terms of green and yellow.