Question

a circular clock face of radius 7cm has a frame of width 7mm around. Find the area of the frame

Answer 1

radius+width of frame=total area of frame
$area \: of \: circle = \pi \times r \times r$
$\pi \times 7.7 \times 7.7$
$186.26$

Answer 2

Answer:

32.310 square cm .

Step-by-step explanation:

Radius of clock face r = 7 cm

Width of frame around the clock = 7 mm

Since 1 cm = 10 mm

So, 7 mm = 0.7 cm

Radius including width of frame R = 7+0.7=7.7 cm

Area of frame = Area of frame including the area of a circular clock face - Area  of clock

                     =$\pi R^{2} -\pi r^{2}$

                     =$3.14 (7.7^{2}-7^{2})$

                     =$32.310$

Hence the area of the frame is 32.310 square cm .