What is the exact length of arc ab?

The exact length of arc is π m

Step-by-step explanation:

In the given figure, we need to find length of arc AB

Formula:

First we will change degree to radian

Radius (r) = 4 m

The length of arc AB is π m

Hence, The exact length of arc is π m

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