
A triangle is a two-dimensional geometrical shape having three sides and three angles. Based on the length of sides and the measure of interior angles, a triangle is categorized into three categories namely,
An acute angled triangle is the one which has all its interior angles less than 90° i.e. all the three angles of an acute angled triangle are acute. For example,
In any traingle ABC, ∠ABC = 40°
∠ACB = 75°
∠CAB = 65°
Here, all the angles of the given triangle are less than 90o. Therefore, ABC is an acute angled triangle.
The perimeter of an acute-angled triangle is obtained by calculating the sum of its sides. For an acute triangle, let the measure of its sides be ‘a’ units, b units and c units then,
perimeter = a + b + c
The area of an acute triangle can be calculated by two methods.
Method 1: By using the area of a triangle
We know that the area of a triangle in a two-dimensional plane is
Area = ½ . base. height
For a triangle of base b and height h
Area = ½ . b. h
Method 2: By using Heron’s formula
By Heron’s formula, we have known,
Area = √[s . (s-a) . (s-b) . (s-c)]
Where ‘s’ is semi perimeter calculated as
S = (a + b + c)/2
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