Click here to win prizes by solving the puzzle Advent calendar.
Click here to win prizes by solving the puzzle Advent calendar.



Three squares

Source: Numberphile
The diagram shows three squares with diagonals drawn on and three angles labelled.
What is the value of \(\alpha+\beta+\gamma\)?

Show answer & extension

If you enjoyed this puzzle, check out Sunday Afternoon Maths XXIX,
puzzles about geometry, or a random puzzle.


Show me a random puzzle
 Most recent collections 

Sunday Afternoon Maths LXVII

Coloured weights
Not Roman numerals

Advent calendar 2018

Sunday Afternoon Maths LXVI

Cryptic crossnumber #2

Sunday Afternoon Maths LXV

Cryptic crossnumber #1
Breaking Chocolate
Square and cube endings

List of all puzzles


sum to infinity folding tube maps advent colouring squares cryptic crossnumbers factorials calculus digits functions algebra menace geometry crosswords books sequences area 2d shapes money probability division square roots ellipses odd numbers floors taxicab geometry grids surds number doubling dates coins lines probabilty averages scales speed addition time parabolas cards multiples planes factors perfect numbers routes volume cryptic clues numbers hexagons complex numbers ave mean means shape integration angles people maths trigonometry quadratics multiplication bases clocks arrows unit fractions regular shapes dice palindromes 3d shapes pascal's triangle chess coordinates logic crossnumbers circles sport partitions triangle numbers shapes dodecagons proportion polygons percentages rugby games spheres christmas prime numbers cube numbers indices sums square numbers fractions symmetry balancing triangles perimeter irreducible numbers integers chalkdust crossnumber chocolate star numbers wordplay graphs remainders differentiation rectangles


Show me a random puzzle
▼ show ▼
© Matthew Scroggs 2012–2019