Question

Find the area and circumference of semicircle diameter 12 cm

Answer 1

$Radius \: = \: \frac{1}{2 } \: \: of \: the \: diameter \: \\ \\ \frac{1}{2} \times 12 = 6cm \\ \\ \\ area \: of \: semicircle \: = \: \frac{\pi {r}^{2} }{2} \\ \\ \frac{3.14 \times {6}^{2} }{2} \: \: \\ \\ After \: simplification \: we \: get \: area \: = \color{lime}{ \underline{\: 56.54 \: {cm}^{2} }}$

$Circumference \: of \: half \: a \: semi \: circle \: = \: \pi r \: + \: 2r$

$Circumference \: = \: 3.14 \times6 + 2 \times 6 \: \: \: \: (taking \: \pi \: as \: 3.14)\\ \\ Circumference \: = \color {red} { \underline{ \: 30.84 \: cm}}$