mscroggs.co.uk
mscroggs.co.uk

subscribe

Puzzles

Two semicircles

The diagram shows two semicircles.
\(CD\) is a chord of the larger circle and is parallel to \(AB\). The length of \(CD\) is 8m. What is the area of the shaded region (in terms of \(\pi\))?

Show answer & extension

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

Archive

Show me a random puzzle
 Most recent collections 

Advent calendar 2024

Advent calendar 2023

Advent calendar 2022

Advent calendar 2021


List of all puzzles

Tags

dice determinants chocolate partitions ave square grids geometric mean wordplay expansions means angles axes number dates bases digital clocks polygons graphs folding tube maps pentagons numbers grids remainders colouring cryptic clues fractions geometry gerrymandering star numbers combinatorics routes proportion decahedra chess quadratics complex numbers pascal's triangle chalkdust crossnumber factors perimeter rugby cubics volume tiling sequences irreducible numbers speed taxicab geometry digits neighbours products coins sets probabilty albgebra menace consecutive numbers numbers doubling range unit fractions elections cryptic crossnumbers shapes averages time 2d shapes integration logic ellipses rectangles the only crossnumber area division dominos money scales shape balancing surds mean books crossnumbers median triangle numbers calculus regular shapes indices spheres trigonometry consecutive integers geometric means grids crosswords coordinates sum to infinity symmetry triangles floors addition palindromes functions cube numbers hexagons square numbers multiples factorials 3d shapes sport christmas planes integers lines polynomials probability odd numbers dodecagons even numbers tangents differentiation percentages squares prime numbers clocks arrows digital products parabolas perfect numbers square roots algebra multiplication matrices circles medians binary games tournaments powers sums advent cards people maths quadrilaterals

Archive

Show me a random puzzle
▼ show ▼
© Matthew Scroggs 2012–2025