Circle and disc. Practical measuring
Answers are for parents and teachers.
1
Find the diameter of a circle of radius 15 cm (cm).
30
2
A disc has diameter 1 m 20 cm. Radius in cm?
60
3
Map scale 1 cm = 60 km. How many km is 7 cm?
420
4
Draw a circle of radius 3 cm with a compass (with an adult’s help). Mark points 2 cm, 3 cm and 4 cm from the centre. Which lies on the circle?
The one 3 cm away
5
Write the difference between a circle and a disc.
A circle is the curve (points at equal distance from the centre); a disc is the part of the plane enclosed by it.