The given triangle is ___________

The angles of a right angled triangle are

Which of the following can be the sides of an isosceles triangle?

Every triangle has at least __________ acute angles.

The sum of three angles of a triangle is ___________.

Classify the given triangles based on its sides as scalene, isosceles or equilateral.

I am a closed figure with each of my three angles is 60°. Who am I?

What are the angles of an isosceles right angled triangle?

Can a triangle be formed with the angles 80°, 30°, 40°?

Draw a line segment AB = 7 cm and mark a point P on it. Draw a line perpendicular to the given line segment at P.

Draw a line segment LM = 6.5 cm and take a point P not lying on it. Using a set square construct a line perpendicular to LM through P.

Can a triangle be formed with the following angles? If yes, name the type of triangle.
(i) 60°, 60°, 60° 
(ii) 90°, 55°, 35° 
(iii) 60°, 40°, 42°
(iv) 60°, 90°, 90°
(v) 70°, 60°, 50°
(vi) 100°, 50°, 30°

Two angles of the triangles are given. Find the third angle.
(i) 80°, 60° 
(ii) 75°, 35°
(iii) 52°, 68°
(iv) 50°, 90°
(v) 120°, 30° 
(vi) 55°, 85°