State True or False.
Isosceles triangle has only acute angles.

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Solution

False
It is not necessary that angles of Isosceles triangle will always be acute angle. It can be obtuse angle also.
For Example : 120 , 30 , 30

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Question 80

State whether the statement is True or False.

It is possible to have a triangle in which two angles are acute.

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If one angle of a triangle is less than 90°, it is known as an acute-angled triangle.

Q. In an acute-angled triangle ABC, the internal bisector of angle A meets base BC at point D. DE

⊥

AB and DF

⊥

AC; hence AEF is an isosceles triangle.
State whether the above statement is true or false.

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State True or False. Isosceles triangle has only acute angles.

False It is not necessary that angles of Isosceles triangle will always be acute angle. It can be obtuse angle also. For Example : 120 , 30 , 30

State True or False.
Isosceles triangle has only acute angles.

False
It is not necessary that angles of Isosceles triangle will always be acute angle. It can be obtuse angle also.
For Example : 120 , 30 , 30