Answer: 150 centimeters cubed
Step-by-step explanation: Let us take a step back and look at the big picture. The triangle is 5cm high and 4cm wide. The to solve the area of a triangle (as you probably know) is length × width. Pretend the height is actually the length because, at the end of the day its 3 things: length, width, and height. It is easy to see the area of the triangle is 10 (4 × 5 = 20, and 20 ÷ 2 = 10) now we just multiply by the width which is, I think, correct me if I'm wrong and I'll do another explanation but I think the width is 15cm. 10 × 15 = 150.