Mensuration Practice Test 1

Let the diameter of circle = x
Circumference = x +16.8
2π r = x +16.8
$2\mathit{\pi }\frac{\mathit{x}}{2}$ = $x + 16.8
πx - x = 16.8
$\mathit{x}\left(\frac{22}{7}-1\right)$ = 16.8
$\mathit{x}\left(\frac{15}{7}\right)$ = 16.8
x = $\frac{16.8\times 7}{15}$ = 7.84 cm
Circumference of the circle = x +16.8
= 7.84 + 16.8
= 24.64 cm