AP State Syllabus 9th Class Maths Solutions 12th Lesson Circles Exercise 12.4 Question 1. In the figure, ‘O’ is the centre of the circle. ∠AOB = 100°, find ∠ADB. Solution: ’O’ is the centre ∠AOB = 100° Thus ∠ACB =…

AP State Syllabus 9th Class Maths Solutions 12th Lesson Circles Exercise 12.3 Question 1. Draw the following triangles and construct circumcircles for them. (OR) In ΔABC, AB = 6 cm, BC = 7 cm and ∠A = 60°. Construct a…

AP State Syllabus 9th Class Maths Solutions 12th Lesson Circles Exercise 12.2 Question 1. In the figure, if AB = CD and ∠AOB = 90° find ∠COD. Solution: ‘O’ is the centre of the circle. AB = CD (equal chords…

AP State Syllabus 9th Class Maths Solutions 12th Lesson Circles Exercise 12.1 Question 1. Name the following from the given figure where ’O’ is the centre of the circle. i) ii) iii) iv) v) vi) vii) viii) Shaded region Solution:…

AP State Syllabus 9th Class Maths Solutions 11th Lesson Areas Exercise 11.3 Question 1. In a triangle ABC, E is the midpoint of median AD. Show that i) ar ΔABE = ar ΔACE Solution: In ΔABC; AD is a median.…

AP State Syllabus 9th Class Maths Solutions 11th Lesson Areas Exercise 11.2 Question 1. The area of parallelogram ABCD is 36cm2. Calculate the height of parallelogram ABEF if AB = 4.2 cm. Solution: Area of □ABCD = 36 cm2 AB…

AP State Syllabus 9th Class Maths Solutions 11th Lesson Areas Exercise 11.1 Question 1. In ΔABC, ∠ABC = 90°; AD = DC; AB =12 cm, BC = 6.5 cm. Find the area of ΔADB Solution: ΔADB = ΔABC [ ∵…

AP State Syllabus 9th Class Maths Solutions 10th Lesson Surface Areas and Volumes Exercise 10.4 Question 1. The radius of a sphere is 3.5 cm. Find its surface area and volume. Solution: Radius of the sphere, r = 3.5 cm…

AP State Syllabus 9th Class Maths Solutions 10th Lesson Surface Areas and Volumes Exercise 10.3 Question 1. The base area of a cone is 38.5 cm Its volume is 77 cm3. Find its height. Solution: Base area of the cone,…

AP State Syllabus 9th Class Maths Solutions 10th Lesson Surface Areas and Volumes Exercise 10.2 Question 1. A closed cylindrical tank of height 1.4 m and radius of the base is 56 cm is made up of a thick metal…