Question

what is the surface area of the three - dimensional figure? s.a. =? in.² area of rectangle a = l·w area of triangle a = \\(\frac{1}{2}(b·h)\\) s.a. = \\(2\left(\frac{1}{2}\
ight)(3·4) + 2(5·5) + 3·5\\)

Explanation:

Step1: Calculate triangular parts

$2 \times \frac{1}{2} \times 3 \times 4 = 12$

Step2: Calculate square parts

$2 \times 5 \times 5 = 50$

Step3: Calculate rectangular part

$3 \times 5 = 15$

Step4: Sum all areas

$12 + 50 + 15 = 77$

Answer:

77