Number Two: The formula to find the volume of a triangular prism is the area of the triangle/base multiplied by the height. Finding the area of the base: 10×15=150×0.5=75 Now multiply it by its height. 75×25 1,875 m³ Number Four: You need to multiply the width times the height times the length, or in any arrangements. Everything needs to get mutiplied together. 1×2.5 2.5×9 22.5 cm³