Heron's formula class 9 Ex 12.1
NCERT Solutions for 9th Maths Chapter 12, Exercise 12.1 involve complete answers for each question in the exercise 12.1. The solutions provide students a stretegic methods to prepare for their exam. Class 9 Maths Chapter 12 Heron's formula exercise 12.1 questions and answers helps students to perform better in exam and it will clear doubts definitely. Students will find it extremely easy to understand the questions and learn solving the problems.NCERT Solutions for Class 9 Maths Chapter 12 Heron's formula prepared by www.mathematicsandinformationtechnology.com team in very delicate, easy and creative way.
Question 1:
A traffic signal board, indicating ‘SCHOOL AHEAD’, is an equilateral triangle with side ‘a’. Find the area of the signal board, using Heron’s formula. If its perimeter is 180 cm, what will be the area of the signal board?
A traffic signal board, indicating ‘SCHOOL AHEAD’, is an equilateral triangle with side ‘a’. Find the area of the signal board, using Heron’s formula. If its perimeter is 180 cm, what will be the area of the signal board?
Solution 1:
Question 2:
The triangular side walls of a flyover have been used for advertisements. The sides of the walls are 122 m, 22 m, and 120 m (see the given figure). The advertisements yield an earning of Rs. 5000 per m2 per year. A company hired one of its walls for 3 months. How much rent did it pay?
The triangular side walls of a flyover have been used for advertisements. The sides of the walls are 122 m, 22 m, and 120 m (see the given figure). The advertisements yield an earning of Rs. 5000 per m2 per year. A company hired one of its walls for 3 months. How much rent did it pay?
Question 3:
The floor of a rectangular hall has a perimeter 250 m. If the cost of panting the four walls at the rate of Rs. 10 per m2 is Rs.15000, find the height of the hall.[Hint: Area of the four walls = Lateral surface area.]
Solution 3:
Question 4:
Find the area of a triangle two sides of which are 18 cm and 10 cm and the perimeter is 42 cm.
Find the area of a triangle two sides of which are 18 cm and 10 cm and the perimeter is 42 cm.
Solution 4:
Question 5:
Sides of a triangle are in the ratio of 12:17:25 and its perimeter is 540 cm. Find its area.
Sides of a triangle are in the ratio of 12:17:25 and its perimeter is 540 cm. Find its area.
Solution 5
Question 6:
An isosceles triangle has perimeter 30 cm and each of the equal sides is 12 cm. Find the area of the triangle.
An isosceles triangle has perimeter 30 cm and each of the equal sides is 12 cm. Find the area of the triangle.
Solution 6:
