# Geometry

posted by .

1. Find the diameter of a circle with a circumference of 50 mm. Round your answer to the nearest tenth.

a) 16.0 mm
b) 26.4 mm
c) 8.4 mm
d) 33.5 mm

2. Find the area of the circle with the given radius or diameter. Round your answer to the nearest tenth.

Diameter = 42.0 mm

a) 137.6mm2
b) 376.7 mm2
c) 1,384.74 mmÂ²
d) 6,027.0 mm2

1. a) 16.0 mm
2. b) 376.7 mm2

• Geometry -

• Geometry -

NEED HELP!!! :( I'm new here so ..... i don't know :( ????!!!

• Geometry -

Please be patient, Sandy. We are volunteer tutors who answer questions when we have the time.

1 is right. 2 is wrong.

Use this formula for the second problem.

A = pi * r^

• Geometry -

OK, I'm so so sorry. It would never happen again! OK thank you so much when i'm finish I'll will tell you the answer OK? :D

• Geometry -

Is it a) 137.6mm2 is the answer because that's what I got ?

• Geometry -

I'm so sorry but i'm in a huge rush ms.sue :( !

• Geometry -

Nope.

Did you use this formula?

A = pi * r^2

• Geometry -

Oops, I'm sorry i got confused the answer is pi(21)^2 = 1384.74

• Geometry -

Right.