Guidance on Solving Exercise 1 on Pages 96 and 97 of Math 5 Textbook
Problem Statement:
Drawing circles with:
a) Radius 3cm;
b) Diameter 5cm.
Solution Method:
Students need to distinguish between two concepts, diameter and radius, to draw accurately:
- The radius of a circle is the distance from any point on the circle to the center of that circle. Symbol: r.
- The diameter of a circle is the greatest distance between any two points on that circle. It is twice the length of the radius. Symbol: d.
- Drawing tool: Compass, ruler.
Answer:
In part b), the radius of the circle is:
5 : 2 = 2.5 (cm)
Mark a point, for example, O (or 2.5cm)
Open the compass so that the needle and the end are separated by 3cm (or 2.5 cm).
Place the needle at point O, press the end against the paper and rotate it exactly one turn. We obtain a circle with center O (or I) and radius 3cm (or 2.5 cm).
a) Radius 3cm
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