The different names a triangle can have and to explore when these definitions can overlap. We should be aiming for learners to be comfortable with Children are often taught about four types of triangles (equilateral, isosceles, scalene and right-angled) in isolation from each other and they may be curious to learn that this is not the whole story. This activity provides an engaging context for children to deepen their understanding of the ways of naming different types of triangles. Look at each space on the grid and try to sketch some different triangles to go in the box.Ĭan you sketch a triangle for every box in the grid? Why/why not? For example, the box at the top on the left is for equilateral acute triangles - these are acute triangles with all three sides the same length. This grid is for matching up the different names for a triangle. How could we do this? What do you think an 'acute triangle' or an 'obtuse triangle' might look like? We normally name triangles by thinking about the lengths of the sides, but in this activity we will also be naming triangles using their angles. Which of these children do you agree with? Why? Using the angles, you get right-angled, acute or obtuse triangles." Using the sides, you can have equilateral, isosceles and scalene triangles. "You can name a triangle using either the sides or the angles of the triangle.
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