SA of triangular prism help please

B. 74

Step-by-step explanation:

The surface area is just the area of the two triangular bases plus the area of the three rectangular sides.

Area of a triangle = (1/2)bh, where b is the base and h is the height. Here, b = 4 and h = 3.5. So: (1/2) * 4 * 3.5 = 7. However, we have two triangles, so we multiply 7 by 2: 7 * 2 = 14.

Area of a rectangle = bh, where b is the base and h is the height. Here, b = 5 and h = 4. So: 5 * 4 = 20. However, there are three rectangles, so we multiply 20 by 3: 20 * 3 = 60.

Now, we just add these together: 14 + 60 = 74.

Thus, the answer is B.

Hope this helps!

2. 74 cm²

Step-by-step explanation:

3 rectangles + 2 triangles

3(4×5) + 2(½×4×3.5)

60 + 14

74 cm²

b

step-by-step explanation:

b