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Quiz

Grade 6: Circles, polygons and triangles

10 questions with solutions for grade 6: radius and diameter, relative positions, diagonals, the angle sum of a triangle, the centroid, sides and angles.

Type the number or choose the right answer. When you finish, click Check answers and see the solutions.

1. A circle has radius 6 cm. How long is its diameter?

2. A circle has diameter 18 cm. How long is its radius?

3. A line with exactly one point in common with a circle is called:

4. Two circles have radii 3 cm and 5 cm and their centres are 8 cm apart. How do they lie?

5. How many diagonals start at one vertex of a hexagon?

6. How many diagonals does a pentagon have in total?

7. Two angles of a triangle are 50° and 60°. How many degrees is the third?

8. In a right-angled triangle one acute angle is 35°. How many degrees is the other?

9. The point where the medians of a triangle meet is called:

10. In every triangle, opposite the longest side is: