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\ 19-Nov-2025 Bharat Arora Proof-9 Reader’s Sign _______________________ Date __________

6. Answer the following:
a. How many acute angles can a triangle have? ______________
b. How many right angles can a triangle have? ______________

c. How many obtuse angles can a triangle have? ______________
d. How many cubes are there in the given arrangement? ______________

Mental Maths

21 st
Choose the correct option. Century #Critical Thinking
Skills
1. How many degrees does the minute hand of a clock turn through in one hour?

a. 90° b. 180° c. 270° d. 360°

2. Each of the following is smaller than a straight angle, except a/an:
a. acute angle b. obtuse angle c. reflex angle d. right angle

3. Which of the following sets of lines does not form an angle?

a. b. c. d.

4. When the hour hand moves from 10 to 1, it makes:

a. a right angle b. an acute angle c. a straight angle d. an obtuse angle

5. When the minute hand moves from 2 to _______, it makes a straight angle.

a. 5 b. 7 c. 8 d. 10

6. Raman is facing north. He turns 3 right angles anticlockwise. In which direction is he
facing now? N

a. East b. West

c. South d. North W E

S

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Geometry