State whether the following statements are true (T) or false (F):

(i) Each angle of an equilateral triangle is a right angle.

(ii) The adjacent sides of a rectangle are equal in length.

(iii) The diagonals of a rectangle are equal in length.

(iv) The diagonals of a rectangle are perpendicular to one another.

(v) The diagonals of a rhombus are equal in length.

(vi) Any three line segments make up a triangle.

(vii) All the faces of a triangular prism are triangles.

(viii) All the faces of a triangular pyramid are triangles.

State whether the following statement is true or false. Justify your answer.

'An angle whose measure is greater than that of a right angle is obtuse'.

A reflex angle measures

1. more than 90° but less than 180°

2. more than 180° but less than 270°

3. more than 180° but less than 360°

4. none of these

A scalene triangle cannot be

1. an acute-angled triangle

2. an obtuse-angled triangle

3. a right-angled triangle

4. an equilateral triangle