Q16 of 61 Page 93

Perimeter of a regular octagon of side 6cm is 36cm.

The perimeter of shaded region is sum of all sides.

So an octagon has 8 sides. [“oct” means 8 as “pent” means 5 and “hex” means 6]

So perimeter = 8 × 6

Perimeter = 48 cm

So the statement is false.

If length of a rectangle is halved and breadth is doubled then the area of the rectangle obtained remains same.

Area of a square is doubled if the side of the square is doubled.

A farmer who wants to fence his field, must find the perimeter of the field.

An engineer who plans to build a compound wall on all sides of a house find the area of the compound.