The radius of a circle is 5 centimeters. What is the length of a 90 arc?

The length of arc is 7.85cm

Step-by-step explanation:

You can find the length of arc by using the formula :

θ = 90°

r = 5cm

Arc = (90/360)×2×π×5

= (1/4)×2×π×5

= (1/4)×10×π

= (5/2)π

= 7.85 cm (3s.f)

given expression is

we have radical  

we need to select an option that has same radical

(a)  

this expression has cube root instead of square root . so it is not a like radical.

(b)

y is included inside the radical. so it is not a like radical.

(c)

this expression has cube root instead of square root . so it is not a like radical.

(d)

5 is inside the radical square root. so it is   a like radical.