Given the following triangle:
Write down the height of the triangle ABC.
Given the following triangle:
Write down the height of the triangle ABC.
Which of the following is the height in triangle ABC?
Can a triangle have two right angles?
Look at the two triangles below. Is EC a side of one of the triangles?
True or false:
DE not a side in any of the triangles.
Given the following triangle:
Write down the height of the triangle ABC.
An altitude in a triangle is the segment that connects the vertex and the opposite side, in such a way that the segment forms a 90-degree angle with the side.
If we look at the image it is clear that the above theorem is true for the line AE. AE not only connects the A vertex with the opposite side. It also crosses BC forming a 90-degree angle. Undoubtedly making AE the altitude.
AE
Which of the following is the height in triangle ABC?
Let's remember the definition of height of a triangle:
A height is a straight line that descends from the vertex of a triangle and forms a 90-degree angle with the opposite side.
The sides that form a 90-degree angle are sides AB and BC. Therefore, the height is AB.
AB
Can a triangle have two right angles?
The sum of angles in a triangle is 180 degrees. Since two angles of 90 degrees equal 180, a triangle can never have two right angles.
No
Look at the two triangles below. Is EC a side of one of the triangles?
Every triangle has 3 sides, let's go over the triangle on the left side:
Its sides are: AB, BC, CA
This means that in this triangle, side EC does not exist.
Let's go over the triangle on the right side:
Its sides are: ED, EF, FD
This means that in this triangle, side EC does not exist.
Therefore, EC is not a side in either of the triangles.
No.
True or false:
DE not a side in any of the triangles.
True
Is DE side in one of the triangles?
Given the following triangle:
Write down the height of the triangle ABC.
Given the following triangle:
Write down the height of the triangle ABC.
Given the following triangle:
Write down the height of the triangle ABC.
Given the following triangle:
Write down the height of the triangle ABC.
Is DE side in one of the triangles?
Not true
Given the following triangle:
Write down the height of the triangle ABC.
AD
Given the following triangle:
Write down the height of the triangle ABC.
BD
Given the following triangle:
Write down the height of the triangle ABC.
AD
Given the following triangle:
Write down the height of the triangle ABC.
BD
Determine the type of angle given.
Determine the type of angle given.
Determine the type of angle given.
Determine the type of angle given.
Can a plane angle be found in a triangle?
Determine the type of angle given.
Map
Determine the type of angle given.
Straight
Determine the type of angle given.
Acute
Determine the type of angle given.
Obtuse
Can a plane angle be found in a triangle?
No
Can a triangle have a right angle?
AB is a side in triangle ADB
DB is a side in triangle ABC
Is DE a side in the triangle BDC?
According to figure BC=CB?
Can a triangle have a right angle?
Yes
AB is a side in triangle ADB
True
DB is a side in triangle ABC
Not true
Is DE a side in the triangle BDC?
Not true
According to figure BC=CB?
True