Answer:
Area = 9(7w -1) cm²
Step-by-step explanation:
Area of a triangle is given by the expression,
Area = [tex]\frac{1}{2}(\text{Base})(\text{height})[/tex]
From the picture attached,
Base of the triangle = 18 cm
Height of the triangle = Vertical distance of the third vertex from the base joining other two vertices = (7w - 1)
Area = [tex]\frac{1}{2}(18)(7w-1)[/tex]
= 9(7w - 1) square cm
Therefore, expression for the area of the given triangle will be,
Area = 9(7w -1) cm²
