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Building with Bricks - Drawing Bricks and Walls

Grade 4CBSE

Review the key concepts, formulae, and examples before starting your quiz.

🔑Concepts

A brick is a 3D solid shape known as a cuboid. It has 66 flat rectangular faces, 1212 straight edges, and 88 corners called vertices. When you look at a brick from one side, it looks like a 2D rectangle.

When drawing a brick to make it look three-dimensional, we usually show 33 faces at once. In a 2D drawing of a single face, you would only see a rectangle. A standard brick does not have any faces that are shaped like circles or triangles.

Bricks can be arranged in different patterns to make walls strong. In a strong wall, bricks are placed in an overlapping manner so that the vertical joints do not line up in a straight line. A wall where bricks are simply stacked one directly on top of another in columns is very weak and can easily fall.

A 'Jali' is a decorative screen or net-like pattern made by leaving specific gaps between bricks in a wall. These gaps allow light and air to pass through while creating beautiful geometric designs.

A 'Jharokha' is a type of overhanging balcony or window design made with bricks. It usually protrudes from the wall and was very common in old palaces and buildings to provide a view of the outside.

An arch is a curved brick structure used to support weight over openings like doors, windows, or bridges. It is shaped like an upside-down 'U' and is built using special wedge-shaped or thin bricks to create the curve.

Brick sizes can vary, but they are measured by their length, width, and height. To understand the size, we can compare dimensions; for example, a brick might be 20 cm20\text{ cm} long, 10 cm10\text{ cm} wide, and 7 cm7\text{ cm} high.

Old bricks and new bricks are often sold in sets of 1,0001,000. This is called the 'Price per thousand bricks'. We use the unitary method to calculate the total cost for different quantities of bricks.

📐Formulae

Total Cost=Number of Bricks×Price per Brick\text{Total Cost} = \text{Number of Bricks} \times \text{Price per Brick}

Price per Brick=Cost of BricksTotal Number of Bricks\text{Price per Brick} = \frac{\text{Cost of Bricks}}{\text{Total Number of Bricks}}

Cost for n bricks=(Price per 1,000 bricks1,000)×n\text{Cost for } n \text{ bricks} = \left( \frac{\text{Price per 1,000 bricks}}{1,000} \right) \times n

💡Examples

Problem 1:

Bhajan went to buy bricks. The price of new bricks from Brickabad was 2,000₹ 2,000 for one thousand bricks. If he wants to buy 3,0003,000 bricks, how much will he pay?

Solution:

  1. Price of 1,0001,000 bricks = 2,000₹ 2,000
  2. Price of 11 brick = 2,0001,000=2\frac{2,000}{1,000} = ₹ 2
  3. Price of 3,0003,000 bricks = 3,000×2=6,0003,000 \times 2 = ₹ 6,000

Explanation:

We first find the cost of a single brick using division and then multiply that unit price by the total number of bricks needed.

Problem 2:

A wall is 1010 bricks long and 1515 rows high. How many bricks are used to build the wall?

Solution:

  1. Number of bricks in one row = 1010
  2. Total number of rows = 1515
  3. Total bricks = 10×15=15010 \times 15 = 150

Explanation:

To find the total number of bricks in a rectangular wall arrangement, multiply the number of bricks in a single row by the total number of rows.