What is the formula to find the triangular number without drawing diagram? For grade 6.
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Area of isosceles triangle
= (½×base×height)
Area of equilateral triangle
= √3/4a²
Area of right angle triangle
= (½×base×height)
Area of scalene triangle
= √s(s − a)(s − b)(s − c)
s = (a+b+c)/2
Perimeter of isosceles triangle
= (2a+b)
Perimeter of equilateral triangle
= (3×side)
Perimeter of right angle triangle
= (base+hypotenuse+h)
Perimeter of scalene triangle
= (a+b+c)
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