SChand Class 9 Chapter 16 Area of plane figures Exercise 16(A)

 Exercise 16(A)

Question 1

Find the perimeter and area of the rectangle whose dimensions are

(i) 8 cm by 5 cm

(ii) 12 m by 9 m

(iii) 3.5 m by 2 m

Sol :

(i) Perimeter = 2(L+B)

=2(8 + 5} cm

=26 cm

Area =(8×5) cm²

=40 cm²

(ii) Perimeter = 2(L+B)

=2(12 + 9)

= 42 m

Area = (12×91)m²

= 108 m²

(iii) Perimeter = 2(L+B)

=2(3.5 + 2) m

=11 m

Area=(3.5 2) m²

=7 m²

Question 2

Find the Perimeter and area of the square whose each side is

(i) 3 cm

(ii) 5 m

(iii) 1.3 m

(iv) 2.4 m

Sol :

[ Perimeter of squire = 4×side and Area at squire = side² ]

(i) Perimeter =(4×3)

= 12 cm

Area = 3² = 9 cm²

(ii) Perimeter = (4×5)

= 20 cm

Area = 5² = 25 cm²

(iii) Perimeter =(4×1.3) m

= 5.2 m

Area = (1.3)² m²

= 1.69 m²

(iv) Perimeter =(4×2.4) m

= 9.6 m

Area =(2.4)² m²

= 5.76 m²