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Maths · Grade 1 · Set B
What makes a triangle
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B
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Goal: 15 min
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Remember: A triangle has 3 straight sides and is closed all round. Colour, size and tilt do not matter.

Spot the triangle

Count the straight sides.

1
Which shape is a triangle?
A
B
C
2
How many straight sides does this shape have?
3
This shape is a triangle.
TrueFalse
4
Which shape is NOT a triangle?
A
B
C
5
How many sides does this shape have?
6
Both of these shapes are triangles.
TrueFalse
7
Circle every triangle.
A
B
C
D
8
Join each shape to its number of sides.
  1. 1pentagon
  2. 2triangle
  3. 3rectangle
  • A5 sides
  • B4 sides
  • C3 sides
9
Pip bends one side of a triangle into a curve. Is it still a triangle?
YesNo
10
How many triangles are there?
11
🔺A shape with 3 straight sides and 3 corners is a .
circletrianglesquare
12
Draw a big triangle and a small triangle.
13
Tell why a circle is not a triangle.
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Answer key · Set B
What makes a triangle
1B A triangle has 3 straight sides. Shape B has 3, even when it is tipped.
23 Count the straight sides: 3. A square corner is fine.
3False It has 5 sides. A triangle has only 3.
4A Shape A has a round side. A triangle has only straight sides.
54 Count the straight sides: 4. It is not a triangle.
6True Tipping a triangle over does not change its 3 straight sides.
7B, C B and C each have 3 straight sides. A has 4 and D has 8.
81-A, 2-C, 3-B
9No A triangle has 3 straight sides. With a round side it is a new shape.
103 The triangle, the one with a square corner and the upside-down one each have 3 straight sides.
11triangle 3 straight sides and 3 corners make a triangle.
13Your own words: a grown-up reads it.
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