all formulas in mensuration of ch11
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Area of square = side^2
Area of rectangle = length × breadth
Area of equilateral triangle = √3/4 × side^2
Area of any triangle = √s(s-a)(s-b)(s-c)
where s=perimeter/2
Area of circle = πr^2
Perimeter of square = 4×side
Perimeter of rectangle = 2(length+breadth)
Perimeter of equilateral triangle = 3×side
Perimeter of any triangle = a+b+c
Circumference of circle = 2πr
Area of circular ring = π(R+r)(R-r)
hope it helps you ☺
pls mark brainliest
Area of rectangle = length × breadth
Area of equilateral triangle = √3/4 × side^2
Area of any triangle = √s(s-a)(s-b)(s-c)
where s=perimeter/2
Area of circle = πr^2
Perimeter of square = 4×side
Perimeter of rectangle = 2(length+breadth)
Perimeter of equilateral triangle = 3×side
Perimeter of any triangle = a+b+c
Circumference of circle = 2πr
Area of circular ring = π(R+r)(R-r)
hope it helps you ☺
pls mark brainliest
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