AP State Syllabus AP Board 6th Class Maths Solutions Chapter 8 Basic Geometric Concepts Ex 8.4 Textbook Questions and Answers.
AP State Syllabus 6th Class Maths Solutions 8th Lesson Basic Geometric Concepts Ex 8.4
Question 1.
Measure all the angles in the above figures.
∠1 = 70°
∠3 = 70°
∠5 = 70°
∠7 = 70°
∠2 = 110°
∠4 = 110°
∠6 = 110°
∠8= 110°
∠a = 60°
∠c = 60°
∠e = 50°
∠g = 50°
∠b = 120°
∠d = 120°
∠f = 130°
∠h = 130°
Question 2.
Sum of which two angles is 180° in each figure ?
Solution:
From above question,
i) ∠1 + ∠2 = 180°
i) ∠1 + ∠2 = 180°
∠2 + ∠3 = 180°
∠1 + ∠4 = 180°
∠3 + ∠4 = 180°
∠5 + ∠6 = 180°
∠6 + ∠7 = 180°
∠7 + ∠8 = 180°
∠5 + ∠8 = 180°
∠1 + ∠8 = 180°
∠4 + ∠5 = 180°
∠2 + ∠7 = 180°
∠3 + ∠6 = 180°
ii) ∠a + ∠b = 180°
∠b + ∠c = 180°
∠c + ∠d = 180°
∠a + ∠d = 180°
∠e + ∠f = 180°
∠f + ∠g = 180°
∠g + ∠h = 180°
∠e + ∠h = 180°
Question 3.
In the given figure measure ∠FOG and draw the same in your note book.
Solution:
Question 4.
In the given figure measure the angles ∠AOB, ∠BOC.
Solution:
∠AOB = 110°
∠BOC = 60°
∠AOC = 50°
Question 5.
Write some acute, obtuse and reflexive angles atleast 2 for each.
Solution:
Acute angles : 10°, 30°, 45°, 60°, 89° (< 90°)
Obtuse angles : 110°, 150°, 160°, 172°, 178° (90° < obtuse < 180°) Reflex angles : 210°, 270°, 300°, 345°, 359° (reflex > 180°)