How do I find the area of a triangle

The area A of a triangle is given by the formula A=12bh where b is the base and h is the height of the triangle.

you find the area of triangle by the formula

1/2×base×height

56.6

step-by-step explanation:

the ratio of the perimeters is equal to the scale.

the ratio of the areas is equal to the square of the scale.

34 / 20 = k

a / 19.6 = k²

substituting:

a / 19.6 = (34 / 20)²

a = 19.6 (34 / 20)²

a ≈ 56.6