# Resources tagged with: Sine rule & cosine rule

Filter by: Content type:
Age range:
Challenge level:

There are 8 NRICH Mathematical resources connected to Sine rule & cosine rule, you may find related items under Pythagoras and Trigonometry.

Broad Topics > Pythagoras and Trigonometry > Sine rule & cosine rule ### Hexy-metry

##### Age 14 to 16Challenge Level

A hexagon, with sides alternately a and b units in length, is inscribed in a circle. How big is the radius of the circle? ##### Age 14 to 16Challenge Level

Given a square ABCD of sides 10 cm, and using the corners as centres, construct four quadrants with radius 10 cm each inside the square. The four arcs intersect at P, Q, R and S. Find the. . . . ##### Age 14 to 16Challenge Level

Four rods are hinged at their ends to form a convex quadrilateral. Investigate the different shapes that the quadrilateral can take. Be patient this problem may be slow to load. ### Calculating with Cosines

##### Age 14 to 18Challenge Level

If I tell you two sides of a right-angled triangle, you can easily work out the third. But what if the angle between the two sides is not a right angle? ### Raising the Roof

##### Age 14 to 16Challenge Level

How far should the roof overhang to shade windows from the mid-day sun? ### Xtra

##### Age 14 to 18Challenge Level

Find the sides of an equilateral triangle ABC where a trapezium BCPQ is drawn with BP=CQ=2 , PQ=1 and AP+AQ=sqrt7 . Note: there are 2 possible interpretations. ### Darts and Kites

##### Age 14 to 16Challenge Level

Explore the geometry of these dart and kite shapes! ### Get Cross

##### Age 14 to 16Challenge Level

A white cross is placed symmetrically in a red disc with the central square of side length sqrt 2 and the arms of the cross of length 1 unit. What is the area of the disc still showing?