General
Unit 12: Square, Rectangle and Triangle
12.1 The Square
(a) Properties of a square
Activity 12.1.1
I have learnt that:
Activity 12.1.2
Activity 12.1.3
(b) Perimeter of a square
Activity 12.1.4
Activity 12.1.5
I have learnt that:
Example:
Activity 12.1.6
12.2 The Rectangle
(a) Properties of a rectangle
Activity 12.2.1
I have learnt that:
Activity 12.1.6
Activity 12.2.3
(b) Perimeter of a rectangle
Activity 12.2.4
Activity 12.2.5
Activity 12.2.6
Example:
Solution:
12.3 The Triangle
(a) Properties of a triangle
Activity 12.3.1
Activity 12.3.2
Activity 12.3.3
(b) Perimeter of a triangle
Activity 12.3.4
Activity 12.3.5
END UNIT ASSESSMENT 12
1. Name the following figures:
2. Answer by YES or NO
(a) A square has 4 equal sides………………
(b) The short sides of a rectangle are called length (L).….
(c) A rectangle has 4 right angles………………….……..
(d) A square has 4 acute angles………………………….
(e) A rectangle has 3 sides, for which 2 are parallel and equal……………..
(f) The long sides of a rectangle are called Width. …….….
(g) A triangle has 4 sides and 3 angles……………………..
3. Find the perimeter of:
(a) A square with the side of 12cm.
(b) A rectangle with the length of 12cm and the width of 8cm.
(c) A triangle which has: 7cm, 8cm and 9cm of sides.
4. Write 1 on a square, write 2 on a rectangle and write 3 on a triangle.
5. Find the perimeter of a flower gardens with the form of:
(a) A square of 80m of side.
(b) A rectangle with 54m of length and 40m of width.
(c) A triangle with 25m, 27m and 30m of sides.
6. Find the perimeter of the following figures:
