how to draw an angle of 80°
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Step1: 90° + 45° = 135°
Step2: 135° ÷ 2 = 67.5°
Step3: 67.5° ÷2 = 33.75°
Step4: 33.75° ÷2 = 16.875°
Step5: Now, we combine angles 33.75° & 16.875° together to get 50.625°
Step6: Now, from our initial 90° angle , the above constructed 50.625 ° is taken off. & We are left with 40° approximately or we can say very very close to 40°. ( as with 100% accuracy, it's not possible to construct the required measure only by using compass)
Step7: Now this 40° is divided into 2 equal parts. We get 20°, which is further divided into 2 equal parts . We get 10°
Step8: Now we construct a fresh 90° angle, out of which the above obtained 10° is cut off. ( by using the method of construction of equal angles)
Finally we get 90° - 10° = 80°
In the above method, we are neglecting the lowest decimal value… Whereas in other methods, we may have to neglect the bigger decimal value, which affects the accuracy more.
Step2: 135° ÷ 2 = 67.5°
Step3: 67.5° ÷2 = 33.75°
Step4: 33.75° ÷2 = 16.875°
Step5: Now, we combine angles 33.75° & 16.875° together to get 50.625°
Step6: Now, from our initial 90° angle , the above constructed 50.625 ° is taken off. & We are left with 40° approximately or we can say very very close to 40°. ( as with 100% accuracy, it's not possible to construct the required measure only by using compass)
Step7: Now this 40° is divided into 2 equal parts. We get 20°, which is further divided into 2 equal parts . We get 10°
Step8: Now we construct a fresh 90° angle, out of which the above obtained 10° is cut off. ( by using the method of construction of equal angles)
Finally we get 90° - 10° = 80°
In the above method, we are neglecting the lowest decimal value… Whereas in other methods, we may have to neglect the bigger decimal value, which affects the accuracy more.
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