Area of a Circle | What's the Difference Between a Circle and a Circumference | Radius, Diamete...

Опубликовано: 31 Август 2026
на канале: I CAN SCHOOL МАТЕМАТИКА АЛГЕБРА

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In this video, we explore the difference between a circumference and a circle and learn how to find the area of a circle using π.

You'll learn why a circumference is a line, while a circle is the part of a plane bounded by the circumference, and why they are measured in different units.

We'll review the radius and diameter, how they are related, and how to use the formula for the area of a circle: S = π r².

We'll also look at examples of calculating the area of a circle given a radius or diameter and learn how to find the radius from a known area of a circle, even without a calculator.

This video is perfect for school students, for reviewing the topic before a test, and for parents and teachers who want to explain the topic in simple and understandable language.

📌 In the video:
• the difference between a circle and a circumference
• radius and diameter
• the number π (pi)
• the formula for the area of a circle
• units of area
• examples with solutions

Circumference:    • КАК ИЗМЕРИТЬ ДЛИНУ ОКРУЖНОСТИ? · ФОРМУЛА +...

⏰ ⏰ ⏰ TIMESTAMPS
00:09 What is the difference between a circle and a circumference?
00:19 What units is the circumference of a circle measured in?
00:24 What units is the area of a circle measured in?
00:33 The Number Pi
00:41 The Formula for the Area of a Circle
00:55 Radius and Diameter
01:18 Calculating the Area of a Circle - 4 Examples
02:44 Calculating the Radius from the Area of a Circle

❗️ The Formula for the Area of a Circle:
S = πR²
2R = D

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8th grade:    • АЛГЕБРА 8 КЛАСС МАТЕМАТИКА УРОКИ РЕПЕТИТОР
9th grade:    • АЛГЕБРА 9 КЛАСС МАТЕМАТИКА  УРОКИ РЕПЕТИТОР
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1st Class:    • АЛГЕБРА 11 КЛАСС МАТЕМАТИКА  УРОКИ РЕПЕТИТОР
Basic State Exam:    • МАТЕМАТИКА ОГЭ ЭКЗАМЕНЫ РАЗБОР ЗАДАЧ 2019 ...
Unified State Exam:    • МАТЕМАТИКА ЕГЭ ЭКЗАМЕНЫ РАЗБОР ЗАДАЧ РЕШУ ...
Higher Mathematics:    • ВЫСШАЯ МАТЕМАТИКА

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