Page 13 - Mesleki Ingilizce Dersi E-Portfolyosu

TRIANGLES

A simple closed curve or a polygon formed by three line and sides is called a triangle.

A

Vertex A

• A triangle has three sides, three angles, and three vertices.

Side c c b

o
• The sum of all internal angles of a triangle is always equal to 180 . This is

called the angle sum property of a triangle.

Angle B B C

a

Triangles can be classified in 2 major ways

• Scalene Triangle • Acute Angled Triangle

• Isosceles Triangle • Right Angled Triangle

• Equilateral Triangle • Obtuse Angled Triangle

: :

SCALENE TRIANGLE ACUTE ANGLED TRIANGLE

• A triangle having all the three line-segments or sides unequal is called • Acute angled triangles are triangles in which the measures of all three

o
a scalene triangle. angles are less than 90 .
A

A

50 o

70 o 60 o
B C B C

ISOSCELES TRIANGLE RIGHT ANGLED TRIANGLE

o
• A triangle having a pair of its sides or two line-segments equal is called • Right triangles are triangles in which the measure of one angle equals 90 .

an isosceles triangle. • The other two angles of a right-angle triangle are acute angles.

• The side opposite to the right angle is the largest side of the triangle and is

A called the hypotenuse.

A

• b = c c b 50 o

B C . 90 o 40 o
a B C

EQUILATERAL TRIANGLE OBTUSE ANGLED TRIANGLE

• A triangle having all the three line-segments or sides equal is called • Obtuse angled triangles are triangles in which the measure of one angle

o
an equilateral triangle. is greater than 90 .

A

• a = b = c 30 o

c b

40 o
110 o

F. Tuğçe KAVUNCU

a E6190051

B = C