T1 (Find the area of the circle with diameter 7 cm.)

The area of the circle is 38.5 cm²

Step-by-step explanation:

The rule of the area of a circle is A = π r², where

Let us solve the question

∵ The diameter of the circle is 7 cm

∴ d = 7 cm

∵ r = d

→ Substitute d by 7

∴ r = (7)

∴ r = 3.5 cm

→ Substitute the value of r in the rule of the area above

∵ A = π (3.5)²

∴ A = 12.25π

∵ π =

∴ A = 12.25 ( )

∴ A = 38.5 cm²

∴ The area of the circle is 38.5 cm²

i believe the correct answer is b.

step-by-step explanation: