Welcome to the second of our Medium level Eleven Plus maths quizzes on shapes. In the last one we tested you on triangles. In this one, we will ask you some questions on the properties of circles.
Circles are one of the most common shapes you will encounter – both in maths lessons and in real life. They are not like polygons, such as squares or triangles. Circles have their own terms and their own formulae for working out things like circumference, area, diameter and more!
One thing you need to know is π. This is the Greek letter pi, pronounced the same as Pie.
If you can get all ten questions right in this quiz, well done! You certainly know your circles. Why not try the rest of our quizzes on shapes? Keep playing them until you can get every answer in every quiz right first time. If you can do that then your knowledge of shapes is most definitely in shape!














I hope that you didn't get this wrong! The perimeter of a curved shape or arc is known as the circumference

There are several formulae we use that involve π and you would do well to learn them!


All the points on the edge of a circle are the same distance from its centre – that’s how pairs of compasses are able to draw circles

There are 360^{o} in a full circle. A semicircle has 180^{o}, a quartercircle 90^{o}, and a threequarter circle has 270^{o}


Pi or π is an important number where circles are concerned. Try to remember its value if you can: 3.142

Area is always measured in units squared (e.g. cm^{2})


When a chord passes through the centre of a circle it is called its diameter

Hemi, demi and semi all mean half, but a halfcircle is a semicircle. Half a sphere is called a hemisphere. A halfmoon shape is a semicircle, but most of the time the moon is shaped like a crescent


Ellipses are like “squashed” circles – the planets orbit the sun in ellipses.
Circles are the most symmetrical of all shapes, and they have the shortest possible perimeter for any given area 
Π goes on forever! Here it is to 100 decimal places: 3.1415926535897932384626433832795028841971693993751058209749445923078164062862089986280348253421170679
