Let's review the properties of shapes to help us in this lesson.
Does a circle have straight or curved edges?
An edge of a shape may be straight or curved. Squares, rectangles and triangles have straight edges. A circle has a curved edge.
Let's learn how to identify the features of circles.
Consider the circle below:
What is the diameter of the circle?
What is the the radius of the circle?
Circles have some important features, such as the radius, diameter and circumference. We can use these features, and others, to identify sectors, semi-circles, and quadrants.
The circumference is the edge of the circle.
The radius is the distance from the centre of the circle to the circumference.
The diameter is the distance from one side of the circumference to the other, that passes through the centre.
manipulates, classifies and draws two-dimensional shapes, including equilateral, isosceles and scalene triangles, and describes their properties