Question

area of plain figures project work.

Answer 1

Area of square : side×side Area of rectangle : length × breadth

Answer 2

                          MENSURATION⇒ PLANE FIGURES

RECTANGLE:

● The perimeter of rectangle = 2(l + b). 

● Area of rectangle = l × b

● Diagonal of rectangle = √(l² + b²)

SQUARE:

● Perimeter of square = 4 × S. 

● Area of square = S × S. 

● Diagonal of square = S√2.

TRIANGLE:

● Perimeter of triangle = (a + b + c)

● Area of triangle = √(s(s - a) (s - b) (s - c))

● S = 1/2 (a + b + c) 

● Area of triangle = 1/2 × base × height; 

● Area of an equilateral triangle = (a²√3)/4.

PARALLELOGRAM:

● Perimeter of parallelogram = 2 (sum of adjacent sides) 

● Area of parallelogram = base × height 

RHOMBUS:

● Area of rhombus = base × height 

● Area of rhombus = 1/2 × length of one diagonal × length of other diagonal

● Perimeter of rhombus = 4 × side

TRAPEZIUM:

● Area of trapezium = 1/2 (sum of parallel sides) × (perpendicular distance between them) 
                                = 1/2 (p₁ + p₂) × h 

CIRCLE:

● Circumference of circle = 2πr

● Area of circle = πr²

● Area of ring = Area of outer circle - Area of inner circle.

-PERFECTBRAINLY