Draw an angle `/_AOB=40^@`. With the same vertex 'O' draw `/_BOC=50^@`, taking `bar(OB)` is initial ray as shown in the figure. Since the sum of these angles is `90^@` they together form a right angle. Take another pair `60^@` and `50^@` and join in the same way. Do they form complementary angles? Why? Why not?

Draw an angle /_AOB=100^@ . With the same vertex O, draw /_BOC=80^@ such that bar(OB) is common to two anglen.

Two adjacent angles are 40 and 140. Do they form a linear pair? Draw a picture and check. Reau drew the picture like this.she has drawn correctly? Do these adjacent angles form a linear pair?

Draw two lines on a paper as shown below. Do they intersect each other? Can you call them parallel lines? Give reason. Make a pair of parallel lines what is the angle formed between them ? Think, discuss with your friends and teacher.

Two adjacent angles are 40degrees and 140degrees.Do they form a linear pair? Draw a picture and check. Renu draw the pictures like this. Has she drawn correctly? Do these adjacent angles form a linear pair?

Draw /_\ABC and form an exterior angleACD Now take a protractor and measure angleACD, angle A and angle B . Find the sum angleA+ angleB and compare it with the measure angleACD .Do you observe that angleACD is equal (or nearly equal) to angleA+ angleB

A particle A is projected with an initial velocity of 60 m/s at an angle 30^(@) to the horizontal. At the same time a second particle B is projected in opposite direction with initial speed of 50 m/s from a A point at a distance of 100 m from A. If the particles collide in air, find (a) the angle of projection of particle B (b) timewhen the collisions takes place and (c) the distance of P from A. where collision occurs. (g=10 m//s^(2))