# Callum Marshall

• ### Triangular Numbers

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Callum Marshall

• ### 3D dot product and angle between vectors

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Callum Marshall

• ### Vector Projections

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Callum Marshall

• ### Exploring a Rotation about the Origin

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Callum Marshall

• ### Bisector of chord in a circle

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Callum Marshall

• ### Similar triangles and side ratios.

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Callum Marshall

• ### The area of an Arbelos

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Callum Marshall

• ### Cylinder - Surface area and volume

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Callum Marshall

• ### Exploring quadratic forms #2

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Callum Marshall

• ### Sine of an angle and its opposite side.

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Callum Marshall

• ### Division of a line in a given ratio

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Callum Marshall

• ### Sine function and radians

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Callum Marshall

• ### The Normal Distribution Curve

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Callum Marshall

• ### Year 11 X_Proving Ptolemy's Theorem

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Callum Marshall

• ### Year 9 - Right Circular Cone

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Callum Marshall

• ### Rugby conversion kick decision?

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Callum Marshall

• ### Proof: intersecting chords theorem

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Callum Marshall

• ### The power of a point; secants and tangents

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Callum Marshall

• ### Area of a triangle using trigonometry

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Callum Marshall

• ### Obtuse angles and the unit circle.

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Callum Marshall

• ### Parabola - basketball: self-test

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Callum Marshall

• ### Folding paper to make a box - visual

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Callum Marshall

• ### Tangents from External Point

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Callum Marshall

• ### Axis of Symmetry - Factored Form

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Callum Marshall