⬡Polygons and circles: math practice, grade 8

Practise “Polygons and circles” online for free. Five right answers in a row make the tasks harder, two mistakes in a row make them easier. Right answers earn coins for games.

Start

Example problems

These are only examples: the practice makes new tasks every time.

1. Find the sum of the angles of a convex polygon. Sides: 5.

   ? °

   Answer

   540

2. Find an angle of a regular polygon. Sides: 18.

   ? °

   Answer

   160

3. Each angle of a regular polygon is 140°. How many sides does it have?

   Answer

   9

4. Each angle of a regular polygon is 135°. How many sides does it have?

   Answer

   8

5. O is the centre of the circle. Find the angle marked “?”.

   ? °

   Answer

   40

6. Triangle ABC is inscribed in a circle and AB is a diameter. Angle A is 61°. Find angle B.

   ? °

   Answer

   29

Start

← All topics