# Search by Topic

#### Resources tagged with Spheres similar to Two Shapes & Printer Ink:

Filter by: Content type:
Stage:
Challenge level:

##### Other tags that relate to Two Shapes & Printer Ink
Scale factors. Circle theorems. Spheres. Arcs, sectors and segments. Similarity. Area. Interactivities. Inscribed circle. Perimeters. Dynamic geometry.

### There are 5 results

Broad Topics > 3D Geometry, Shape and Space > Spheres

### Three Balls

##### Stage: 4 Challenge Level:

A circle has centre O and angle POR = angle QOR. Construct tangents at P and Q meeting at T. Draw a circle with diameter OT. Do P and Q lie inside, or on, or outside this circle?

### Ball Packing

##### Stage: 4 Challenge Level:

If a ball is rolled into the corner of a room how far is its centre from the corner?

### There and Back Again

##### Stage: 3 Challenge Level:

Bilbo goes on an adventure, before arriving back home. Using the information given about his journey, can you work out where Bilbo lives?

### When the Angles of a Triangle Don't Add up to 180 Degrees

##### Stage: 4 and 5

This article outlines the underlying axioms of spherical geometry giving a simple proof that the sum of the angles of a triangle on the surface of a unit sphere is equal to pi plus the area of the. . . .

### Mouhefanggai

##### Stage: 4

Imagine two identical cylindrical pipes meeting at right angles and think about the shape of the space which belongs to both pipes. Early Chinese mathematicians call this shape the mouhefanggai.