Rotate the rectangle ABCD 90° clockwise about the point (0,-1). Each corner of the image A'B'C'D' is the same distance from the centre of rotation as the original shape.

When we go backwards in time through the history of the cosmos, the distances and volumes shrink, while the average energy ...

Types of lenses (converging and diverging), convex and concave, action of a lens as a set of prisms; technical terms; centre of curvature, radii of curvature, principal axis, foci, focal plane and ...

In order to derive the formula to calculate the angle at the centre of the sector, the formulae for the arc length and area of a sector can be rearranged so that we can calculate the fraction of ...

The historic centre of Shakhrisyabz contains a collection of exceptional monuments and ancient quarters which bear witness to the city's secular development, and particularly to the period of its ...

Please note that audiobooks and ebooks purchased from this site must be accessed on the Princeton University Press app. After you make your purchase, you will receive ...

The river meander and rocky slopes of the castle hill are the most important elements which along with the link to the picturesque neighbouring landscape, determine not only the impressive urban ...

Rising up within the centre of the living area, the complex double curvature of the tent-like structure concludes in a glazed OCUIUS that enables sunlight to track across the immaculate internal ...

This is the gargantuan black hole that lives at the centre of our galaxy, pictured for the very first time. Known as Sagittarius A*, the object is a staggering four million times the mass of our Sun.

Space travel has once again become the centre of attention after China announced its cheapest commercial tickets ... a flight ...

In a property market crying out for turnkey renovated homes, a once-forgettable house has undergone a dramatic reinvention ...

Use precise geolocation data and actively scan device characteristics for identification. This is done to store and access information on a device and to provide personalised ads and content, ad and ...