Search by Topic

Resources tagged with Ruler & protractor constructions similar to Gold Again:

Filter by: Content type:
Stage:
Challenge level: Challenge Level:1 Challenge Level:2 Challenge Level:3

There is 1 result

Broad Topics > 2D Geometry, Shape and Space > Ruler & protractor constructions

problem icon

Gold Again

Stage: 5 Challenge Level: Challenge Level:1

Without using a calculator, computer or tables find the exact values of cos36cos72 and also cos36 - cos72.


The NRICH Project aims to enrich the mathematical experiences of all learners. To support this aim, members of the NRICH team work in a wide range of capacities, including providing professional development for teachers wishing to embed rich mathematical tasks into everyday classroom practice. More information on many of our other activities can be found here.
Copyright © 1997 - 2012. University of Cambridge. All rights reserved.
NRICH is part of the family of activities in the Millennium Mathematics Project.