Class 7 - Arjun

Ex 13.1

• perimeter of circle - circumference - 2 * pi * r or pi * d
• perimeter of semicircle - pi * r
• diameter
• radius
• centre

Ex 13.2

• area of rectangle
• area of square
• area of parallelogram = base * altitude
• area of triangle
• area of rhombus = 1/2 (product of 2 diagonals)
• area of path outside or inside ractangular park
• area of cross roads

Ex 13.3

• area of circle
• area of semi circle
• area of a quadrant of a circle = (pi * r * r) / 4