# Top ten vote issue 06

What is the best mathematical celebration day?

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# How to make: a hyperbolic plane

#### You will need

• triangle paper
• scissors
• sticky tape

#### Instructions

1. Cut out a hexagon and a triangle from the triangle paper.

2. Cut along one of the lines from a corner of the hexagon to the centre.

3. Tape the triangle between the two edges of the cut you just made. There is now more than 360° around the point, so the surface will not be flat.

4. Continue to tape more triangles to the surface, making sure there are always seven triangles at each point.

5. Congratulations! You have made a hyperbolic surface.

# Top 10 emoji for use in mathematics

Maths loves symbols. Everyone loves emoji. It’s 2017 and time we brought the two together. To get you started, here are our top ten emoji for use in mathematics!

## 10.

📐

Don’t leave home without one: it’s the nifty 45° set square. What better reminder is there that
$$\sin\left(\frac{\pi}{4}\right) = \frac{\sqrt{2}}{2}, \qquad \cos\left(\frac{\pi}{4}\right) = \frac{\sqrt{2}}{2}, \qquad \tan\left(\frac{\pi}{4}\right) = 1$$ 📐

## 9.

🏹

Perfect for popping over a letter to make it a vector, it’s the bow and arrow:

# Top ten vote issue 05

What is the best geometry instrument?

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# Top ten vote issue 04

What is the best part of a circle?

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