Midsegment
Learning objectives
You will develop the following competences: communicating in English, mathematical, IT and basic scientific and technical competence, your learning skills.
You will get to know the method of finding the midsegment marked in the coordinate system and equations of a perpendicular bisector.
You will apply the property of a median of a triangle.
Learning effect
You will learn to find the midsegment marked in the coordinate system and equations of a perpendicular bisector.
You will learn to apply the property of a median of a triangle.
Put your information about a segmentsegment in the coordinate system and the axial symmetry in order.
Complete the sentences:
b) The length of segment AB, where A(xIndeks dolny AA, yIndeks dolny AA), B(xIndeks dolny BB, yIndeks dolny BB) can be calculated using formula [tu uzupełnij].
c) The length of segment AB, where where A(xIndeks dolny AA, 0), B(xIndeks dolny BB, 0) can be calculated using formula [tu uzupełnij].
d) The length of segment AB, where A(0, yIndeks dolny AA), B(0, yIndeks dolny BB) can be calculated using formula [tu uzupełnij].
b) The length of segment AB, where A(xIndeks dolny AA, yIndeks dolny AA), B(xIndeks dolny BB, yIndeks dolny BB) can be calculated using formula [tu uzupełnij].
c) The length of segment AB, where where A(xIndeks dolny AA, 0), B(xIndeks dolny BB, 0) can be calculated using formula [tu uzupełnij].
d) The length of segment AB, where A(0, yIndeks dolny AA), B(0, yIndeks dolny BB) can be calculated using formula [tu uzupełnij].
The aim of the class is finding the midsegmentmidsegment marked in the coordinate system and equations of a perpendicular bisectorperpendicular bisector.
Analyse the material shown in the Slideshow. Formulate an appropriate conclusion.

Zasób interaktywny dostępny pod adresem https://zpe.gov.pl/a/Dp0qC9GKJ
Use the information to solve the tasks.
Find the coordinates of the midsegmentmidsegment of AB, if:
A ( 0; 7), B ( - 4; 0)
A ( - 6; 7), B ( - 4; 0)
A ( 5; 7), B ( - 4; - 7)
A( - 4; - 5), B ( 6; 3)
Three vertices of parallelogram ABCD, A ( - 3; - 1), B ( 3; - 2), C ( 5; 2) and the intersection of diagonals point P ( 1; 0,5) are given. Find the coordinates of vertex D in this parallelogram. Draw parallelogram ABCD in the coordinate system.
SegmentSegment AB, where A ( 6a; 4), B ( 2a; 4b) and point S ( a; b), which is the midsegmentmidsegment of AB are given. Calculate a and b.
Think – How can you find the equation of the perpendicular bisectorperpendicular bisector of segmentsegment AB? Formulate an appropriate conclusion.
In order to find the equation of the perpendicular bisectorperpendicular bisector of segment AB you need to:
a. Find the coordinates of the midsegmentmidsegment of AB,
b. Find the equation of a line passing through points A and B,
c. Find the equation of a line perpendicular to segmentsegment AB and passing through its midsegmentmidsegment.
Use the information to solve the tasks.
Find the equation of the perpendicular bisectorperpendicular bisector of segmentsegment AB, where A ( - 2; - 10), B ( 4; 8).
Think – how to find the equation of a perpendicular bisector? Formulate an appropriate conclusion.
To find the equation of a perpendicular bisectorperpendicular bisector you need to calculate the coordinates of the bisector of a side of a triangle, then, find the equation of a line passing through the found bisector of a side and a vertex of a triangle, which is not the end of this side.
Using the information, solve the tasks.
Triangle ABC, where A ( - 1; - 4), B ( 10; 4) and C ( 4; 6) is given. Find the equation of the medians of this triangle.
An extra task:
Calculate the area of rhombus ABCD with vertices A ( - 2; - 4), B ( 2; 6), whose diagonals intersect at point ( 2; 4).
Having finished all the tasks, do the consolidation tasks. Then, formulate the conclusions to memorize.
The midsegmentmidsegment of AB, where is point .
In order to find the equation of the perpendicular bisector of segmentsegment AB you need to:
a) Find the coordinates of the midsegmentmidsegment of AB,
b) Find the equation of a line passing through points A and B,
c) Find the equation of a line perpendicular to segment AB and passing through its midsegmentmidsegment.To find the equation of a perpendicular bisectorperpendicular bisector you need to calculate the coordinates of the bisector of a side of a triangle, then, find the equation of a line passing through the found bisector of a side and a vertex of a triangle, which is not the end of this side.
Exercises
If point S (-2; 3) is the midsegment with ends A (a; 0) and B (-1; b), then:
- a + b = 0
- a + b = 1
- a + b = 2
- a +b = 3
Segment with ends A (4; - 3) and B (6; - 11) is the hypotenuse of a right triangle. Give the coordinates of the circumcentre of the circle circumscribed on a triangle and calculate the radius of this circle.
Describe in English the method of finding the midsegment.
Indicate which pairs of expressions or words are translated correctly.
- odcinek - segment
- środek odcinka - midsegment
- symetralna odcinka - perpendicular bisector
- środkowa boku trójkąta - median
- współrzędne punktu - length of a segment
- pole rombu - coordinates of a point
- median
- odcinek
- symetralna odcinka
- coordinates of a point
- środkowa boku trójkąta
- midsegment
- segment
- środek odcinka
- współrzędne punktu
- perpendicular bisector
Glossary
pole rombu
Nagranie dostępne na portalu epodreczniki.pl
wymowa w języku angielskim: area of a rhombus
okrąg opisany na trójkącie
Nagranie dostępne na portalu epodreczniki.pl
wymowa w języku angielskim: circle circumscribed on a triangle
współrzędne punktu
Nagranie dostępne na portalu epodreczniki.pl
wymowa w języku angielskim: coordinates of a point
długość odcinka
Nagranie dostępne na portalu epodreczniki.pl
wymowa w języku angielskim: length of a segment
środkowa boku trójkąta
Nagranie dostępne na portalu epodreczniki.pl
wymowa w języku angielskim: median
środek odcinka
Nagranie dostępne na portalu epodreczniki.pl
wymowa w języku angielskim: midsegment
symetralna odcinka
Nagranie dostępne na portalu epodreczniki.pl
wymowa w języku angielskim: perpendicular bisector
odcinek
Keywords
coordinates of a pointcoordinates of a point
medianmedian
midsegmentmidsegment
perpendicular bisectorperpendicular bisector
segmentsegment