# Resources tagged with: Scalar products

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There are 11 NRICH Mathematical resources connected to Scalar products, you may find related items under Vectors and Matrices.

Broad Topics > Vectors and Matrices > Scalar products ### Cubestick

##### Age 16 to 18Challenge Level

Stick some cubes together to make a cuboid. Find two of the angles by as many different methods as you can devise. ### Multiplication of Vectors

##### Age 16 to 18

An account of multiplication of vectors, both scalar products and vector products. ### Flexi Quads

##### Age 16 to 18Challenge Level

A quadrilateral changes shape with the edge lengths constant. Show the scalar product of the diagonals is constant. If the diagonals are perpendicular in one position are they always perpendicular? ### Cross with the Scalar Product

##### Age 16 to 18Challenge Level

Explore the meaning of the scalar and vector cross products and see how the two are related. ### Coordinated Crystals

##### Age 16 to 18Challenge Level

Explore the lattice and vector structure of this crystal. ### Bond Angles

##### Age 16 to 18Challenge Level

Think about the bond angles occurring in a simple tetrahedral molecule and ammonia. ### Quaternions and Reflections

##### Age 16 to 18Challenge Level

See how 4 dimensional quaternions involve vectors in 3-space and how the quaternion function F(v) = nvn gives a simple algebraic method of working with reflections in planes in 3-space. ### Pythagoras on a Sphere

##### Age 16 to 18Challenge Level

Prove Pythagoras' Theorem for right-angled spherical triangles. ### Walls

##### Age 16 to 18Challenge Level

Plane 1 contains points A, B and C and plane 2 contains points A and B. Find all the points on plane 2 such that the two planes are perpendicular. ### Air Routes

##### Age 16 to 18Challenge Level

Find the distance of the shortest air route at an altitude of 6000 metres between London and Cape Town given the latitudes and longitudes. A simple application of scalar products of vectors. ### Flexi Quad Tan

##### Age 16 to 18Challenge Level

As a quadrilateral Q is deformed (keeping the edge lengths constnt) the diagonals and the angle X between them change. Prove that the area of Q is proportional to tanX.