Introduce the cylinder, introduce the sphere 1.1. Knowledge to remember a) Cylindrical introduction Milk cartons are cylindrical in shape Cylinder The cylinder has two bases, two equal circles and one surrounding face. b) Sphere Introduction 1.2. Solve textbook exercises page 126 Lesson 1 Textbook page 126 Which of the following figures is a … [Read more...] about Introduce the cylinder, introduce the sphere

# Chapter 3: Geometry

## Volume of a cube

Volume of a cube 1.1. Knowledge to remember a) Example If the cube has sides 3cm, the volume is: V = 3 x 3 x 3 = 27 (cm3) b) To calculate the volume of a cube, multiply the side by the side and then multiply by the side. If a cube has side a, then the volume V is: V = axaxa 1.2. Solve textbook exercises on pages 122, 123 Lesson 1 Textbook page 122 Write … [Read more...] about Volume of a cube

## Volume of rectangular box

Volume of rectangular box 1.1. Knowledge to remember a) Example: Find the volume of a rectangular box with length 20cm, width 16cm and height 10cm. To calculate the volume of the above rectangular box in cubic centimeters, we need to find the number of cubes 1cm3 Fill the box (see the drawings below). After stacking 10 layers of 1cm . cube3 the box is just … [Read more...] about Volume of rectangular box

## Cubic meters

Cubic meters 1.1. Knowledge to remember a) Cubic meter To measure volume, people also use cubic meters. Cubic meter is the volume of a cube with side length 1m. Cubic meter is abbreviated as m3 . - A cube with side 1m consists of 1000 cubes with side 1dm. We have: 1m3 = 1000dm3 1m3 = 1 000 000 cm3 (= 100 x 100 x 100) b) Comments: - Each unit of volume … [Read more...] about Cubic meters

## Cubic centimeter gasoline. Cubic decimeter

Cubic centimeter gasoline. Cubic decimeter 1.1. Knowledge to remember To measure volume one can use the following units: cubic centimeters, cubic centimeters. a) Cubic centimeter is the volume of a cube with sides 1 cm long. Centimeters abbreviated as cm3 b) Cubic decimeter is the volume of a cube with sides 1dm long. Cubic decimeter is abbreviated as dm3 c) A … [Read more...] about Cubic centimeter gasoline. Cubic decimeter

## Volume of a figure

Volume of a figure 1.1. Knowledge to remember a) Example 1 In the figure below, the cube is completely inside the rectangular box. We say: The volume of the smaller cube is greater than the volume of the rectangular box or the volume of the rectangular box is greater than the volume of the cube. b) Example 2 Figure C consists of 4 identical cubes and Figure … [Read more...] about Volume of a figure

## Practice on calculating the total and surrounding area of a cube

Practice on calculating the total and surrounding area of a cube 1.1. Solving exercises in the textbook Practice page 112 Lesson 1 Textbook page 112 Calculate the perimeter and total area of a cube with sides 2m 5cm. Solution guide: Exchange: 2m 5cm = 2.05m The perimeter of the given cube is: 2.05 × 2.05 × 4 = 16.81 (m2) The total area of the … [Read more...] about Practice on calculating the total and surrounding area of a cube

## Surrounding area and total area of a cube

Surrounding area and total area of a cube Lesson 1: Calculate the perimeter and total area of a cube with side a given below: a = 3.5 cm; a = 1.5m; a = 2.4dm Solution With a = 3.5 cm, then Sxq = 3.5 x 3.5 x 4 = 49 (cm2) Scity = 3.5 x 3.5 x 6 = 73.5 (cm2) For a = 1.5 cm, then Sxq = 1.5 x 1.5 x 4 = 9 (m2) Scity = 1.5 x 1.5 x 6 = 13.50 (m2) With a = … [Read more...] about Surrounding area and total area of a cube

## Practice calculating the total and surrounding area of a rectangular box

Practice calculating the total and surrounding area of a rectangular box 1.1. Solving exercises in the textbook Practice page 110 Lesson 1 Textbook page 110 Calculate the perimeter and total area of a rectangular box with: a) Length 25dm, width 1.5m and height 18dm. b) Length \(\frac{4}{5}\)m, width \(\frac{1}{3}\)m and height \(\frac{1}{4}\)m. Solution … [Read more...] about Practice calculating the total and surrounding area of a rectangular box

## Surrounding area and total area of rectangular box

Surrounding area and total area of rectangular box Lesson 1: Calculate the perimeter and total area of a rectangular box of length a, width b, height c whose dimensions are given below. a. a = 4dm; b = 3dm; c = 2dm b. a = 12cm; b = 8cm; c = 7cm c. a = \(\frac{5}{7}\) m; b = \(\frac{2}{5}\) m; c = \(\frac{1}{2}\) m Solution a. Sxq = (a + b) x 2 xc = … [Read more...] about Surrounding area and total area of rectangular box