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Answer» ANSWER: - Area of the Area = 1/2 x base x height
- If a , b , c are the SIDES of the traingle ,
then perimeter of the triangle = a + b+ c - Semi – perimeter= a+b+c/2
- Area of the triangle = √s(s−a)(s−b)(s−c)
- Area of the equilateral triangle = 3√4a2
- The perimeter of rectangle = 2(l + b).
- Area of rectangle = l × b; (l and b are the length and breadth of rectangle)
- Diagonal of rectangle =√ l2+b2b2
- Perimeter of square = 4 × S.
- Area of square = S × S.
- Diagonal of square = S√2; (S is the side of square)
- Perimeter of parallelogram = 2 (sum of adjacent sides)
- Area of parallelogram = base × height
- Area of rhombus = base × height
- Area of rhombus = 12× length of one diagonal × length of other diagonal
- Perimeter of rhombus = 4 × side
- Circumference of CIRCLE = 2πr = πd ,Where, π = 3.14 or π = 22/7
- r is the radius of circle
- d is the diameter of circle
- Area of circle = πr2
- Area of ring = Area of OUTER circle - Area of inner circle.
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