Question

Find the perimeter and area (for a & b) of:a) A square of side 3.2 cm.b) A rectangle of length 7.2 cm and breadth 3.8 cm.c) An equilateral tria
ngle with side 12.5 cm.​

Answer 1

Answer:

A) Given

Side of square = 3.2cm

Perimeter of square =4s=4*3.2=12.8 cm

b) given

length of rectangle =7.2cm

breadth of rectangle=3.8cm

Perimeter of rectangle=2(l+b)=2(7.2+3.8)=22cm

c) given

side of triangle =12.5cm

(we know that in a equilateral triangle every side is equal so other two sides is also equal to 12.5 cm)

Peri.eter of equilateral triangle = 3×side = 3×12.5

=37.5 cm

Answer 2

Answer:

a) perimeter of square :- 4× side = 4× 3.2cm = 12.8 cm

area of square :- side × side = 3.2 × 3.2 cm = 10.24 cm

b) perimeter of rectangle :- 2×(l+b) = 2×(7.2+3.8 cm) = 22 cm

area of rectangle:- l× b = 7.2 × 3.8 cm = 27.36 cm

c) perimeter of equilateral triangle :- 3× side= 3×12.5 cm = 37.5 cm

area of equilateral triangle :- 67.66cm²

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