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```					  Name________________________________ Period _______ Date _________________

Triangles
Rule No. 1       Triangles are polygons having 3 sides.
Rule No. 2       The sum of all three angles of a triangle is always 180 degrees.
Rule No. 3       A triangle with 2 sides of equal length is called isosceles triangle.
Rule No. 4       An isosceles triangle has 2 equal angles corresponding to 2 equal sides.
Rule No. 5       A triangle having all three sides equal is called equilateral triangle.
Rule No. 6       An equilateral triangle has all angles equal.
Rule No. 7       A triangle having one angle of 90 degrees is called right triangle.
Rule No. 8       A triangle with each angle less than 90 degrees is called acute triangle.
Rule No. 9       A triangle with one angle greater than 90 degrees is called obtuse triangle.
Rule No. 10      The longest side in a right triangle is always opposite to angle of 90 degrees.

With the help of the above rules, write down all the missing angle values and mention the
types of the triangles below;

55o                                                  60o

90o                                                                               75o

Type:                                Type:                              Type:

40o
50o                                                    15o
105o
Hypotenuse

Type:                                Type:                              Type:

90o
60o
155o
o
60
60o                                                               12o

Type:                               Type:                               Type:
Name___________ANSWER KEY__________ Period _______ Date _________________

Triangles
Rule No. 1               Triangles are polygons having 3 sides.
Rule No. 2               The sum of all three angles of a triangle is always 180 degrees.
Rule No. 3               A triangle with 2 sides of equal length is called isosceles triangle.
Rule No. 4               An isosceles triangle has 2 equal angles corresponding to 2 equal sides.
Rule No. 5               A triangle having all three sides equal is called equilateral triangle.
Rule No. 6               An equilateral triangle has all angles equal.
Rule No. 7               A triangle having one angle of 90 degrees is called right triangle.
Rule No. 8               A triangle with each angle less than 90 degrees is called acute triangle.
Rule No. 9               A triangle with one angle greater than 90 degrees is called obtuse triangle.
Rule No. 10              The longest side in a right triangle is always opposite to angle of 90 degrees.

With the help of the above rules, write down all the missing angle values and mention the
types of the triangles below;

55o                                                                                             30o
60o

90o                             35o                   60o                     60o             75o     75o

Type: Right Triangle                         Type: Equilateral Triangle            Type: Isosceles Triangle

90o
35o

40o
150o
50o                       400           15o                 15o
105o                               Hypotenuse

Type: Obtuse Triangle                        Type: Right Triangle                  Type: Isosceles Triangle

13o
o                       90o                    30o
60
60o                                                                                     155o
o
60                                    12o
60o

Type: Equilateral Triangle                   Type: Right Triangle                  Type: Obtuse Triangle

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