Heron’s Formula Class 9 Notes Maths - Chapter 12
Chapter: 12
What Are Heron’s Formula ?
Area
Area of plane figure is a measure of region enclosed by it.
Area Of Triangle
- By Altitude : Area = (1/2)(b × h) b = base, h = altitude
- By Heron’s Formula : Area =√s(s-a)(s-b)(s-c)
where s =(a+b+c/2)
(s = semiperimeter) and a, b, c are the sides of the triangle.
Area Of Isosceles Triangle
Area = (b/4) √4a2-b2
Where, b = base
a = equal sides
Area Of Equilateral Triangle
Area =(√3/4)×a2
Where, a = equal sides
Altitude (Height) Of Equilateral Triangle
Altitude (h) =(√3/2)×a
Where, a = side
