Question

1. if the diameter of a circle is 28cm, then the radius of the circle is _________ cm.
2. the measure of a complete circle is _____________
3. the perimeter of a rectangle is ____________
4.
$a {}^{2} - b {}^{2}$
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Answer 1

Answer:

1st. 14cm

2nd.360 degree

3rd.2(L+B)

Answer 2

ANSWER1-14CM

ANSWER2-360°

ANSWER3-2×(L+B)