Math 6 Chapter 2 Lesson 9: Triangles 1. Summary of theory Tóm 1.1. What is triangle ABC? Define: Triangle ABC is a figure consisting of three line segments AB; BC; CA when three points A; B; C is not collinear. Sign: The triangle ABC is denoted by \(\Delta ABC\). We also call the name and symbol of the triangle ABC as \(\Delta \)BCA, … [Read more...] about Math 6 Chapter 2 Lesson 9: Triangles

# Math Lesson 6

## Math 6 Chapter 2 Lesson 8: Circles

Math 6 Chapter 2 Lesson 8: Circles 1. Summary of theory Tóm 1.1. Circles and circles A circle with center O, radius r, denoted (O; r) is a figure consisting of points r at a distance from point O. For example: Circle with center O and radius OM = 1.7 cm. Attention: For every point in the plane, then: If ON < R, then point N is inside the circle … [Read more...] about Math 6 Chapter 2 Lesson 8: Circles

## Math 6 Chapter 2 Lesson 7: Practice measuring angles on the ground

Math 6 Chapter 2 Lesson 7: Practice measuring angles on the ground 1. Summary of theory Tóm 1.1. Angle measuring instrument on the ground - Measure the angle on the ground with a trigonometer (figure below) - Structure of the trigonometry: A circular disc is placed horizontally on a tripod. On the top of the disc there is a rotating rod that … [Read more...] about Math 6 Chapter 2 Lesson 7: Practice measuring angles on the ground

## Math 6 Chapter 2 Lesson 6: Bisector of angle

Math 6 Chapter 2 Lesson 6: Bisector of angle 1. Summary of theory Tóm The bisector of an angle is the ray that lies between the two sides of the angle and forms two equal angles with that side. - Ray Oz is the bisector of angle xOt, then: Oz ray lies between two rays Ox, Oy. \(\widehat {xOy} = \widehat {zOy}\) Or \(\widehat {xOz} = \widehat {zOy} … [Read more...] about Math 6 Chapter 2 Lesson 6: Bisector of angle

## Math 6 Chapter 2 Lesson 5: Draw an angle that gives the measure

Math 6 Chapter 2 Lesson 5: Draw an angle that gives the measure 1. Summary of theory Tóm Given an Ox ray, how to draw the angle \(\widehat {xOy}=m^0\) with \(0< m < 180\): - Place the protractor so that the center of the ruler coincides with the angle O of the Ox ray and the Ox ray passes through the 0 . lineo - Draw an Oy ray across the m . lineo of the … [Read more...] about Math 6 Chapter 2 Lesson 5: Draw an angle that gives the measure