Question

please help me to find out the answer​

Answer 1

Answer:

5cm x 2cm=10cm

Step-by-step explanation:

Formula to find area

rectangle-height x width

Answer 2

$\sf \: See \: that \: the \: all \: shaded \: region \: are \: half \: of \: the \: picture. \\ \\ \sf \: (1) \: \frac{15 \times 4}{2} = \frac{60}{2} = 30 {cm}^{2} \\ \\ \sf \: (2)\frac{10 \times 3}{2} = \frac{30}{2} = 15 {cm}^{2} \\ \\ \sf(3) \frac{5 \times 2}{2} = \frac{10}{2} = 5 {cm}^{2}$