dars
lab
free school lessons
Lessons
My cabinet
Badges
About
Grade 8
1
2
3
4
5
6
7
8
9
soon
10
soon
11
soon
🌐
EN
UZ
O‘zbekcha
EN
English
RU
Русский
Log in
Algebra
Geometry
Uzbek language
Literature
English
Russian language
Computing
History of Uzbekistan
World history
Physics
Chemistry
Biology (Human body and health)
Geography
Technology
State and law
Economics
Advertisement
728×90 · 320×100
Review of Grade 7
1
Review of Grade 7
Lessons 1
§1
Quadrilaterals
2
Polygons. Sums of interior and exterior angles
Lessons 2–3
3
The parallelogram and its tests
Lessons 4–5
4
The rectangle and the rhombus
Lessons 6–7
5
The square and the midline of a triangle
Lessons 8–9
6
The trapezoid and the isosceles trapezoid
Lessons 10–11
7
The midline of a trapezoid
Lessons 12
8
Thales’ theorem and its use
Lessons 13–14
9
Reflection in an axis
Lessons 15–16
10
Central symmetry
Lessons 17–18
§2
Areas
11
The idea of area and measuring area
Lessons 19–20
12
Area of a rectangle
Lessons 21
13
Area of a parallelogram and of a triangle
Lessons 22–23
14
Area of a rhombus
Lessons 24
15
Area of a trapezoid
Lessons 25
16
Area of a polygon and support problems
Lessons 26–27
§3
The Pythagorean theorem
17
Pythagoras and his theorem
Lessons 28
18
Proof of the Pythagorean theorem
Lessons 29
19
Consequences of the theorem and the converse
Lessons 30
20
Finding a triangle’s altitude from its sides
Lessons 31
21
Heron’s formula and problem solving
Lessons 32–33
§4
The circle
22
The circle. The central angle
Lessons 34
23
Properties of a chord and a diameter
Lessons 35
24
A line and a circle. The tangent
Lessons 36
25
The inscribed angle
Lessons 37
26
The inscribed and circumscribed circle
Lessons 38–39
27
Angles formed by lines meeting a circle
Lessons 40
§5
Vectors
28
The idea of a vector. Adding and subtracting vectors
Lessons 41–42
29
Multiplying a vector by a number and applying vectors
Lessons 43–44
30
Coordinates of a vector and operations on them
Lessons 45–46
31
The scalar product. Physical meaning of vectors
Lessons 47–48
Grade 8 review
32
Grade 8 review
Lessons 49
☰ Contents · Geometry
Grade 8
›
Geometry
›
Week 12
Area of a rectangle
Lessons 21 · 1 lessons · A. A. Rahimqoriyev, M. A. To‘xtaxo‘jayeva. Geometry, Grade 8 (textbook for general secondary schools), revised 3rd edition. Yangiyo‘l Poligraf Servis, Tashkent, 2014
Lesson 21
Quiz
8
Homework
5
Turn on JavaScript in your browser to take the quiz.
← Previous
Week 12 · Lesson 21: Area of a rectangle
Next →
Week 12 · Homework
Advertisement
300×250 · 728×90