#5 Diagonal lines
Set by Katie Steckles
A square has two diagonals (lines that run from one corner to a different corner, but not between two corners on the same edge).
How many diagonals does a pentagon have? What about a hexagon?
What kind of regular polygon has a number of diagonals that is three times the number of its corners?
Solution next week
#4 Addition subtraction
Solution
For the four-number case, we can do 12 + 34 = 43 + 2 + 1.
For the five-number case, while 12 + 34 + 5 = 5 + 43 + 2 + 1 will work (deleting the same pluses as before), you can also do 12 + 3 + 45 = 54 + 3 + 2 + 1.
Quick quiz #237
set by Bethan Ackerley
1 Which was the earliest age in the Holocene Epoch: the Northgrippian, the Greenlandian or the Meghalayan?
2 Which natural satellite of the asteroid Didymos was targeted by NASA's Double Asteroid Redirection Test?
3 In which city was the ancient Greek polymath Archimedes born?
4 What is the smallest living crocodilian species?
5 What name is given to loss of muscle strength associated with ageing or immobility?
Quick quiz #237
Answers
1 The Greenlandian
2 Dimorphos
3 Syracuse, in what is now Italy
4 Cuvier's dwarf caiman (Paleosuchus palpebrosus)
5 Sarcopenia