Question

find area and perimeter of semicircle whose diameter is 14 cm

Answer 1

area of a semicircle is 1/2*22/7*r^2 sq.units
               since the area is 77 sq.cm
and perimeter is 22/7*r units
              since the perimeter is 22 cm

Answer 2

D = 14cm r= 7cm

$perimeter \: of \: semi \: circle \: = \pi \: r$

= (22/7)×7

= 22cm

$area \: of \: semi \: circle \: = \pi \: r {}^{2} \div 2$

= (22×7×7) / 7×2

$= 77cm {}^{2}$