Answer:

Step-by-step explanation:
Area of a circle is π*r²
sub what we're given
49π= πr²
49π= π*r²
r²= 49π/π
r²=49
r=7
The diameter is twice the radius therefore the diameter is 14 units
Ans: The measure of exterior angle i.e angle A is -52⁰.
You meant to say that the measure of an angle A is on exterior angle so let me elaborate it you clearly,

Answer: 3.9 x 10-2
Step-by-step explanation:
If 2 1/2 centimeters make 1 inch, do 12 x 2 1/2, you should get 30 centimeters