Selina Concise Mathematics Class 9 ICSE Maths Solutions Chapter 20 - Area and Perimeter of Plane Figures
Selina Concise Mathematics Class 9 ICSE Solutions Area and Perimeter of Plane Figures Selina ICSE Solutions for Class 9 Maths Chapter 20 Area and Perimeter of Plane Figures Exercise 20(A) 1. Find the area of a triangle whose sides are 18 cm, 24 cm and 30 cm. Also, find the length of altitude corresponding to the largest side of the triangle. Solution 1: 2. The length of the sides of a triangle are in the ratio 3: 4: 5. Find the area of the triangle if its perimeter is 144 cm. Solution 2: 3. ABC is a triangle in which AB = AC = 4 cm and A = 90 o . Calculate: (i) The area of ABC, (ii) The length of perpendicular from A to BC. Solution 3: 4. The area of an equilateral triangle is sq. cm. Find its perimeter. Solution 4: 5. Find the area of an isosceles triangle with perimeter is 36 cm and base is 16 cm. Solution 5 : Since the perimeter of the isosceles triangle is 36cm and base is 16cm. 6.The base of an isosceles tri...