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Question
Look for triangles in the pictures below.
From the activity ‘Changing Shapes’ can you guess why triangles are used in these towers, bridges, etc.?
Solution
The triangles are used in the towers and bridges so as to make them strong. We know that a triangle is the strongest polygon out of all the other polygons. The angles can get changed in other polygons. However, in a triangle, the angles can not change once the triangle is built.
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RELATED QUESTIONS
Look at the shape and answer.
The angle marked in ______ color is the biggest angle.
How many different shapes can you make by changing the angle between the matchsticks in these? Try.
4 matchsticks
8 matchsticks
5 matchsticks
7 matchsticks
10 matchsticks
Take 8 matchsticks and make a fish like this. Now pick up any 3 matchsticks and put them in such a way that the fish now starts swimming in the opposite direction. Did it?
Using 10 matchsticks make this shape. Pick any 5 matchsticks and put them in such a way that you get the shape of a house.
Now make these 4, 5, 6 sided shapes by using tube pieces and matchsticks.
Find out how many angles are there in each of these shapes. Mark them.
Now push each shape downwards with the tip of your finger.
Does the angle change when pushed down by the finger?
Now push each shape downwards with the tip of your finger.
Does the angle change when pushed down by the finger?
Find out and write your results in the table given:
| Shape | Change in angle Yes/No |
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Now make these 4, 5, 6 sided shapes by using tube pieces and matchsticks.
Find out how many angles are there in each of these shapes. Mark them.
Look for triangles in the pictures below.
Look around and find out more places where triangles are used.
