[br]Step 1: Use the "polygon" tool to create a triangle.[br][br]Step 2: Choose one of the three sides to be the base. Use the "line" tool to create a line along the chosen base. [br][br]Step 3: Use the "perpendicular line" tool to create a perpendicular line from the opposite vertex to the base. [br][br]Step 4. Use the "point" tool to create the intersection point. [br][br]Step 5: Right click the two lines and uncheck the "Show object" box. [br][br]Step 6: Use the "segment" tool to connect the dots. Click the segments and change the setting to dotted lines. [br][br]Step 7: Use the "angle" tool to create a right angle. Click the angle and change the angle to "0° to 180°".[br][br]Step 8: Right click the height label and rename it as "H_1". Right click the base label and rename it as "B_1".[br][br]Repeat the above steps for the other two bases and corresponding heights