Free practice on Circles, Quadrilaterals and Polygons for Class 6, following the Cameroon primary school curriculum (English subsystem). Every answer is explained, so a parent who is not sure of the answer can still help.
Circumference C = 2πr = πd. Area A = πr². Diameter d = 2r. Use π ≈ 3.14 or 22/7 for calculations. For r = 7 cm: C ≈ 44 cm, A ≈ 154 cm².
| r | Circumference (2πr) | Area (πr²) |
|---|---|---|
| 1 cm | 6.28 cm | 3.14 cm² |
| 3 cm | 18.84 cm | 28.26 cm² |
| 7 cm | 44 cm | 154 cm² |
| 10 cm | 62.8 cm | 314 cm² |
Square, rectangle, rhombus, parallelogram, trapezium, kite. Each has properties: which sides are equal, which are parallel, what angles they make.
| Shape | Sides | Angles |
|---|---|---|
| Square | 4 equal | 4 × 90° |
| Rectangle | opposite equal | 4 × 90° |
| Rhombus | 4 equal | opposite equal |
| Parallelogram | opposite equal & parallel | opposite equal |
| Trapezium | 1 pair parallel | sum 360° |
| Kite | 2 pairs of equal | 1 pair equal |
Interior angles of a polygon: sum = (n − 2) × 180°. For a pentagon (5 sides): 3 × 180° = 540°. For a hexagon (6 sides): 4 × 180° = 720°.
| Polygon | Sides | Sum of interior angles |
|---|---|---|
| Triangle | 3 | 180° |
| Quadrilateral | 4 | 360° |
| Pentagon | 5 | 540° |
| Hexagon | 6 | 720° |
| Heptagon | 7 | 900° |
| Octagon | 8 | 1080° |
A circle has diameter 14 cm. Using π = 22/7, what is its circumference in cm?
Write your answer, then check below.
Answer: 44
C = π × d = 22/7 × 14 = 44 cm.
A circular garden has radius 14 m. Using π = 22/7, what is its circumference in metres?
Write your answer, then check below.
Answer: 88
C = 2 × 22/7 × 14 = 88 m.
A circle has radius 7 cm. Using π = 22/7, what is its area in square cm?
Write your answer, then check below.
Answer: 154
Area = 22/7 × 7 × 7 = 154.
How many sides does a pentagon have?
Write your answer, then check below.
Answer: 5
The angles of any quadrilateral add up to how many degrees?
Write your answer, then check below.
Answer: 360
The app holds every question on this page and hundreds more, works with no internet after the first load, and costs nothing. It fits on a shared phone.
