## MAT B41 — Exam Multiple Choice Statistics

MAT B41 wrote their exam today!

The multiple choice have been graded and we got the following information.

It looks like the class did alright, the average is quite good.

*Average:* 70

*Median:* 73

*Standard deviation:* 16.7

These are just the statistics for the multiple choice questions.

The full grades should be available early next week.

## Science Unlimited — Knot Theory and Cat’s Cradle: A Brief Introduction to Storer Calculus

The handout for the talk is available here:

https://pgadey.ca/teaching/talks/science-unlimited-2018-storer-calculus.pdf

## Canada Math Camp — Storer Calculus

The handout for the talk is available here:

https://pgadey.ca/teaching/talks/cmc-2018-storer-calculus.pdf

## MAT B41 — Week 12

**You made it to the last week! You’re done!**

On Homework 5, you solved the Napkin Ring Problem. Check it out! That is super cool!

**Additional resources:**

- Khan Academy on triple integrals (Pt. 1).
- Khan Academy on triple integrals (Pt. 2).
- Kristal King on triple integrals.
- PatrickJMT on triple integrals.

**Suggested Exercises:**

- 6.1 Geometry of Maps from to : 1, 3, 6, 11
- 6.2 The Change of Variables Theorem: 3, 4, 7, 10, 11, 21, 23, 26, 28
- 6.3 Applications : 1, 3, 4, 5, 6, 11, 13, 16

**Notes:**

The notes are available here.

## Mock Final Exam!

**The Mock Final is now available!**

Thanks everyone, who came out and wrote today! We had about thirty people in total. The last writer finished at approximated 14:50pm. It seems like the final will take approximately three hours. Please attempt the mock final, it is the best preparation for the real final.

## MAT B41 — Week 11

**Homework 5 is due! Homework 6 (tex) is now available!**

The Mock Midterm will be Friday July 27 in SY110 from 12–3pm.

**Additional resources:**

- Khan Academy on triple integrals (Pt. 1).
- Khan Academy on triple integrals (Pt. 2).
- Kristal King on triple integrals.
- PatrickJMT on triple integrals.

**Suggested Exercises:**

- 5.4 Changing the Order of Integration: 2,3,7,9,14
- 5.5 The Triple Integral: 1,3,4,9,10,11,12,16,18,20,21

**Notes:**

## Homework #5 Question 4

Consider a solid ball of radius . Cut a cylindrical hole, through the center of the ball, such that the remaining body has height . Call this the donut . Use Cavalieri’s principle to calculate the volume of . Calculate the volumes of and .

Several students have asked what looks like. Here are some pictures that I found to illustrate the concept. The donut is the region between the red sphere and blue cylinder. The golden balls below show various views of the donut. The donut should fit between the two planes and , so that it has total height .

## MAT B41 — Week 10

There has been a minor change to the syllabus: Homework 6 will now be assigned in Week 11 and due in Week 12.

**Additional resources:**

- Khan Academy on constrained optimization.
- Eugene Khutoryansky on Double Integrals (after five minutes the video goes beyond our course).
- PatrickJMT on Changing Order of Integration (Pt.1)
- PatrickJMT on Changing Order of Integration (Pt.2)

**Geogebra Demonstrations:**

- Cavalieri’s Principle with Triangles by Irina Boyadzhiev
- Archimede’s Cone-Sphere Theorem by Brian Sterr

**Suggested Exercises:**

- 5.1 Introduction to Double and Triple Integrals: 1,2,3,8,9,13
- 5.2 The Double Integral over a Rectangle: 1,2,3,4,5,6
- 5.3 The Double Integral over a More General Regions: 1,2,3,7,13

**Past Finals:**

*Final 2015*: Find the volume of the solid bound by the parabolic cylinder and the planes , , and .*Final 2015*: Evaluate where is the region bounded by and for .*Final 2016*: Evaluate where is triangle with vertices , , and .*Final 2016*: Evaluate .

**Notes:**

## Malin Christersson’s Cube Toy

I was looking through the Geogebra site and found this lovely applet Orthographic Projection by Malin Christersson.

This is a lovely tool for investigating one of my favourite facts about hexagons:

*The area maximizing orthogonal projection of a cube is the regular hexagon*.

It turns out that Malin has tonnes of awesome geometry stuff online!

- Hyperbolic tiler!
- Pythagora’s Tree!
- A whole Tumblr full of great animations!

Awesome math art!

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