Ex 11.1, 4 (iii) - Ex 11.1

Ex 11.1, 4 (iii) - Chapter 11 Class 9 Constructions - Part 2
Ex 11.1, 4 (iii) - Chapter 11 Class 9 Constructions - Part 3

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Transcript

Question 4 Construct the following angles and verify by measuring them by a Protractor : 135° 135° = 90° + 45° So, to make 135° , we make 90° and then 45° Steps of construction Draw a line OAA’. Taking O as center and any radius, draw an arc cutting OA at B. 3. Now, with B as center and same radius as before, draw an arc intersecting the previously drawn arc at point C. 4. With C as center and the same radius, draw an arc cutting the arc at D. 5. With C and D as centers and radius more than 1/2 CD, draw two arcs intersecting at P. Thus, ∠ AOP = 90° Also, ∠ A’OP = 90° So, we bisect ∠ A’OP Mark point Q where OP intersects the arc With B’ and Q as centers and radius more than 1/2 B’Q, draw two arcs intersecting at R. Join OR. ∴ ∠ POR = 45° Thus, ∠ AOR = ∠ AOP + ∠ POR = 90° + 35° = 135° ∴ ∠ AOR = 135°

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Davneet Singh has done his B.Tech from Indian Institute of Technology, Kanpur. He has been teaching from the past 13 years. He provides courses for Maths, Science, Social Science, Physics, Chemistry, Computer Science at Teachoo.