Question

2. Find the perimeter of the following:
a. A circle with a diameter 7 cm
b. The triangle with side 1500 mm,400 mm,and,320mm.

Answer 1

22 cm
2200 mm
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Answer 2

Answer:

a)  21.98 cm

b) 2220 mm

Step-by-step explanation:

(a) Perimeter of the circle = 2πr

Here they gave only diameter

But we know that radius is half of the diameter

So radius  =  1/2 × 7

Radius = 3.5 cm

π = 3.14

So perimeter  = 2 × 3.14 × 3.5

                       ⇒ 2 × 10.99

                Perimeter  ⇒ 21.98 cm

(b)

Perimeter of triangle =  Sum of all sides

So perimeter = 1500  + 400 + 320

                      Perimeter ⇒ 2220 mm

Hope this will help you