C = 2 pie r

a) Find the value of C when t = 3.142 and r = 5

A = pie r squared

b) Find the value of A when pie = 3.142 and r = 5

Circumference, C is 31.42 units and Area, A is 78.55 sq. units

Step-by-step explanation:

Step 1: Find C when π = 3.142 and r = 5

C = 2πr = 2 * 3.142 * 5

= 31.42 units

Step 2: Find A when π = 3.142 and r = 5

A = πr² = 3.142 * 5² = 3.142 * 25

= 78.55 sq. units