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Question 1 In Fig. 2.23, list all the angles possible. Did you find them all? Now, guess the measures of all the angles. Then, measure the angles with a protractor. Record all your numbers in a table. See how close your guesses are to the actual measures. There are a lot of angles here For an angle, we need 1 vertex 2 arms from that vertex So, we take every corner point and make angles from there Now, instead of guessing every angle and measuring it We try with one angle - ∠ ACD Now, ∠ ACD seems acute angle, so less than 90° Let’s assume it is 65°. Now let’s find from Protractor Finding ∠ ACD from protractor Thus, ∠ ACD = 74° Now, can you try other angles and name the measurement in the comment below?

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Davneet Singh

Davneet Singh has done his B.Tech from Indian Institute of Technology, Kanpur. He has been teaching from the past 15 years. He provides courses for Maths, Science and Computer Science at Teachoo