# Puzzles, Issue 01

These puzzles appeared in Issue 01 of the magazine.

### #2 – Circles

Source: MathsJam
Pictured are: a quarter circle with radius 2r, and two semi circles with radius r.
Prove that the pink area is equal to the green area.

### #104 – Two Triangles

Source: MathsJam
In the diagram, the three sides of a triangle have been split into thirds, then the lines have been added.
What is the area of the smaller shaded triangle as a fraction of the area of the large triangle?

The answers to these puzzles are available here.

These puzzles appeared in Issue 01 of the magazine.

### #2 – Circles

Source: MathsJam
Pictured are: a quarter circle with radius 2r, and two semi circles with radius r.
Prove that the pink area is equal to the green area.

### #104 – Two Triangles

Source: MathsJam
In the diagram, the three sides of a triangle have been split into thirds, then the lines have been added.
What is the area of the smaller shaded triangle as a fraction of the area of the large triangle?

The answers to these puzzles are available here.

• ### Math Games with Bad Drawings

We review the fifth of this year’s nominees for the Book of the Year
• ### Peculiar Deaths of Famous Mathematicians

We review the third of this year’s nominees for the Book of the Year
• ### An Introduction to the Math of Voting Methods

We review the second of this year’s nominees for the Book of the Year
• ### A Ring of Cats and Dogs

We review the first of this year’s nominees for the Book of the Year
• ### Chalkdust Book of the Year 2022

We announce the shortlist of our favourite maths-themed books of last year
• ### Come to the issue 16 launch party

Celebrate the latest issue with us in London on 28 November