Use π = 3 19. calculate the area of a circle with diameter of 14cm

Area of a circle = PI x r^2

you state pi = 3.19  ( it is usually 3.14, if it is a typo see below )

diameter = 14cm
 r = 1/2 the diameter, so r = 7 cm

area = 3.19 x 7^2

area = 3.19 x 49 = 156.31 square cm

( if PI = 3.14, area = 3.14 * 49 = 153.86 square cm)

The equation for Area of circle:

A = πr²

Using pi as 3.14
r = radius, d = diameter

r = d/2
r = 14/2
r = 7

A = (3.14)7²
A = 49(3.14)
A = 153.86 cm²

Using pi as 3.19
A = πr²
A = (3.19)7²
A = 49(3.19)
A = 156.31cm²

hope this helps

None of those are technically correct. 9.7 x 104 is actually 1,008.8, but if that answer was a choice, it would be that one. if you meant 9.7 times maybe a thousand or more or divided by 10 or more, than the answer choices would be correct, but other than that, they actually arent.