Question

Наййти преметр прямоугольника для 3 класса

Answer 1

Формула нахождения периметра прямоугольника:
(a+b) ×2

Answer 2

Finding the Perimeter of a Rectangle for 3rd Grade

To find the perimeter of a rectangle, you need to add up the lengths of all four sides of the rectangle. The formula for finding the perimeter of a rectangle is:

Perimeter (P) = 2 * (length + width)

Let's look at some examples:

1. Example 1: - Given: Length (a) = 9 units, Width (b) = 20 units - Using the formula: P = 2 * (a + b) - Substituting the values: P = 2 * (9 + 20) - Calculating: P = 2 * 29 = 58 units.

2. Example 2: - Given: Length (a) = 3 units, Width (b) = 4 units - Using the formula: P = 2 * (a + b) - Substituting the values: P = 2 * (3 + 4) - Calculating: P = 2 * 7 = 14 units.

3. Example 3: - Given: Length (a) = 20 units, Width (b) = 30 units - Using the formula: P = 2 * (a + b) - Substituting the values: P = 2 * (20 + 30) - Calculating: P = 2 * 50 = 100 units.

So, the perimeter of a rectangle can vary depending on the lengths of its sides.

Finding the Area of a Rectangle for 3rd Grade

To find the area of a rectangle, you need to multiply the length by the width. The formula for finding the area of a rectangle is:

Area (S) = length * width

Let's look at some examples:

1. Example 1: - Given: Length (a) = 4 units, Width (b) = 4 units - Using the formula: S = a * b - Substituting the values: S = 4 * 4 = 16 square units.

2. Example 2: - Given: Length (a) = 6 units, Width (b) = 8 units - Using the formula: S = a * b - Substituting the values: S = 6 * 8 = 48 square units.

3. Example 3: - Given: Length (a) = 5 units, Width (b) = 8 units - Using the formula: S = a * b - Substituting the values: S = 5 * 8 = 40 square units.

So, the area of a rectangle can vary depending on the lengths of its sides.

I hope this helps! Let me know if you have any further questions.