Three circles with their centres and a triangle ABC. Given that D is the midpoint of BC, prove that quadrilateral ABEF and triangle ECF have both equal perimeter and equal area.

Categories

geometry puzzles

Categories

- Post author By Rik
- Post date November 2, 2022
- No Comments on Ceteris paribus

- Tags area, circle, perimeter, quadrilateral, triangle

Categories

- Post author By Rik
- Post date August 17, 2022
- No Comments on Slightly skewed

Two overlapping equilateral triangles with side lengths 1. What is the total red length?

Categories

- Post author By Rik
- Post date June 14, 2021
- No Comments on The green field

A square is divided in two quadrilaterals of given area. What fraction of the square’s perimeter is red?

- Tags area, fraction, perimeter, quadrilateral, square

Categories

- Post author By Rik
- Post date December 14, 2020
- No Comments on The Post-it note

Two unit squares (having side 1) are placed as shown. What is the total perimeter of the two red triangles?