Question

2. Find: -3/7 + 2/3

3. Find the perimeter of the figure, which is a semicircle including its diameter.Drawing uper he ​

Answer 1

2.

$\frac{ - 3}{7} + \frac{2}{3}$

$\frac{ - 3 \times 3 + 7 \times 2}{21}$

$\frac{ - 9 + 14}{21}$

$\frac{5}{21}$

3.

:- diameter ( d ) of given semi circle = 10cm

:- radius ( r ) of given semi circle = 10/2 = 5 cm

:- Circumference / Perimeter of the given semi circle = 2πr/2 + diameter of semi circle

:- πr + d

:-

$\frac{22}{7} \times 5 + 10$

:-

$\frac{110}{7} + 10$

:-

$\frac{110 + 70}{7}$

:-

$\frac{180}{7} cm$

Therefore , Perimeter of the Given semi - circle is 180/7 cm .