If one acute angle of a right-angled triangle is 20°, the other angle is ……

In an isosceles triangle, the non-equal angle (verticele angle) is 40° then equal angles are

The exterior angle of an equilateral triangle is ……?

If the measure of two angles of a triangle are 35°, 84°, then the third angle is ……?

Three angles of a triangle are (x + 30°), 2x, (3x – 30°) then x = …?

In a right angled triangle one is 43° then the third angle is ……

The exterior angle of a triangle is 136° and its two opposite interior angles is 8 : 9 then the smallest angle of these two angles is ……?

Which of the following is not true?

Which of the following measurements form a triangle?

About a triangle which of the following is true?