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14. Can we have two acute angles whose sum is:
(a) an acute angle? Why or why not?
(b) a right angle? Why or why not?
(c) an obtuse angle? Why or why not?
(d) a straight angle? Why or why not?
(e) a reflex angle? Why or why not?
15. Can we have two obtuse angles whose sum is:
(a) a reflex angle? Why or why not?
(b) a complete angle? Why or why not?

Real life Application of Angles

• Architects and engineers use angles to design houses, roads, bridges, etc.

• Carpenters use angles to design furniture such as sofas, tables, chairs etc.
• The longitudes and latitudes of a place can be measured through angles.
• The rotation of the Earth and other planets are
measured in angles.
• Artists use angles to draw portraits and paintings.
• Cricketers use certain angles to lift the ball, while in
javeline throw, the angle plays a vital role.
• Nowadays, in some schools, doors are designed in
such a way that the door shows the angle at which
it is opened.

maths fun

This is a classroom game that requires two teams. To play this angle game, both teams will be
sit apart so that the action of Team 1 cannot be seen by Team 2 during the activity. They will
follow the working instructions for the game.
Requirements: Pencil, Jar with number chits, protractor, scale

59 Lines and Angles