Class 9: Maths Chapter 7 solutions. Complete Class 9 Maths Chapter 7 Notes.
Contents
RS Aggarwal Solutions for Class 9 Maths Chapter 7–Areas
RS Aggarwal 9th Maths Chapter 7, Class 9 Maths Chapter 7 solutions
Question 1.
Solution:
Base of the triangle (b) = 24cm and height (h) = 14.5 cm
∴ Area = 12 x b x h = 12 x 24 x 14.5 cm²
= 174 cm² Ans.
Question 2.
Solution:
Let the length of altitude of the triangular field = x then its base = 3x.
Question 3.
Solution:
Sides of a triangle = 42cm, 34cm and 20cm
Let a = 42cm, b = 34cm and c = 20 cm
Question 4.
Solution:
Sides of the triangle = 18cm, 24cm and 30cm
Let a = 18 cm, b = 24 cm and c = 30cm
Question 5.
Solution:
Sides of triangular field ABC arc 91m, 98m and 105m
Let AC be the longest side
∴ BD⊥AC
Here a = 98m, b = 105m and c = 91m
Question 6.
Solution:
Perimeter of triangle = 150m
Ratio in the sides = 5:12:13
Let sides be 5x, 12x and 13x
Question 7.
Solution:
Perimeter of a triangular field = 540m
Ratio is its sides = 25 : 17 : 12
Question 8.
Solution:
Perimeter of the triangular field = 324 m
Length of the sides are 85m and 154m
Question 9.
Solution:
Length of sides are
13 cm, 13 cm and 20cm
Question 10.
Solution:
Base of the isosceles triangle ABC = 80cm
Area = 360 cm²
Question 11.
Solution:
Perimeter of the triangle
ABC = 42 cm.
Let length of each equal sides = x
Question 12.
Solution:
Area of equilateral triangle = 36√3 cm².
Let length of each side = a
Question 13.
Solution:
Area of equilateral triangle = 81√3 cm²
Let length of each side = a
Question 14.
Solution:
∆ ABC is a right angled triangle, right angle at B.
∴ BC 48cm and AC = 50cm
Question 15.
Solution:
Each side of equilateral triangle
(a) = 8cm.
Question 16.
Solution:
Let a be the each side of
the equilateral triangle.
Question 17.
Solution:
The given umbrella has 12 triangular pieces of the size 50cm x 20cm x 50cm. We see that each piece is of an isosceles triangle shape and we have to find firstly area of one such triangle.
Question 18.
Solution:
The given floral design is made of 16 tiles
The size of each tile is 16cm 12cm, 20cm
Now we have to find the area of firstly one tile
Question 19.
Solution:
Question 20.
Solution:
In the figure, ABCD is a quadrilateral
AB = 42 cm, BC = 21 cm, CD = 29 cm,
DA = 34 cm and ∠CBD = 90°
Question 21.
Solution:
from the figure
∆DAB
Question 22.
Solution:
Question 23.
Solution:
from the figure,
We know that
Question 24.
Solution:
RS Aggarwal Solutions for Class 9 Maths Chapter 7: Download PDF
RS Aggarwal Solutions for Class 9 Maths Chapter 7–Areas
Download PDF: RS Aggarwal Solutions for Class 9 Maths Chapter 7–Areas PDF
Chapterwise RS Aggarwal Solutions for Class 9 Maths :
- Chapter 1–Real Numbers
- Chapter 2–Polynomials
- Chapter 3–Introduction to Euclid’s Geometry
- Chapter 4–Lines and Triangles
- Chapter 5–Congruence of Triangles and Inequalities in a Triangle
- Chapter 6–Coordinate Geometry
- Chapter 7–Areas
- Chapter 8–Linear Equations in Two Variables
- Chapter 9–Quadrilaterals and Parallelograms
- Chapter 10–Area
- Chapter 11–Circle
- Chapter 12–Geometrical Constructions
- Chapter 13–Volume and Surface Area
- Chapter 14–Statistics
- Chapter 15–Probability
About RS Aggarwal Class 9 Book
Investing in an R.S. Aggarwal book will never be of waste since you can use the book to prepare for various competitive exams as well. RS Aggarwal is one of the most prominent books with an endless number of problems. R.S. Aggarwal’s book very neatly explains every derivation, formula, and question in a very consolidated manner. It has tonnes of examples, practice questions, and solutions even for the NCERT questions.
He was born on January 2, 1946 in a village of Delhi. He graduated from Kirori Mal College, University of Delhi. After completing his M.Sc. in Mathematics in 1969, he joined N.A.S. College, Meerut, as a lecturer. In 1976, he was awarded a fellowship for 3 years and joined the University of Delhi for his Ph.D. Thereafter, he was promoted as a reader in N.A.S. College, Meerut. In 1999, he joined M.M.H. College, Ghaziabad, as a reader and took voluntary retirement in 2003. He has authored more than 75 titles ranging from Nursery to M. Sc. He has also written books for competitive examinations right from the clerical grade to the I.A.S. level.
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