Question

b. find the area of the figure by using composition.
10 cm
12 cm
7 cm
5 cm

Explanation:

Step1: Calculate area of rectangle

$\text{Área}_{\text{rectángulo}} = 12 \times 10 = 120 \, \text{cm}^2$

Step2: Calculate area of triangle

$\text{Área}_{\text{triángulo}} = \frac{1}{2} \times 7 \times 5 = 17.5 \, \text{cm}^2$

Step3: Sum both areas

$\text{Área}_{\text{total}} = 120 + 17.5$

Answer:

$137.5 \, \text{cm}^2$