Question

area of figure rectangle plus triangle

Answer 1

area of rectangle
$(l \times b) = 3 \times 15 \\ 45 {cm}^{2}$
area of triangle
$\frac{1}{2} \times base \times height \\ \frac{1}{2} \times 4 \times 5 \\ 10 {cm}^{2}$
area of total figure= 10+45= 55cm^2

Answer 2

area of rectangle + area of square
l × w + 1 ÷ 2 × b × h
15 × 3 + 1 ÷ 2 × 5 × 4
45 + 1 ÷ 2 × 10
45 + 10
55cm square