2 Answers:
- Choice A) pi/2 + 1 + 1
- Choice E) 3.57
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Explanation:
The perimeter around a full circle is known as the circumference. The formula for the circumference is
C = pi*d
where d is the diameter. In this case, d = 1, so the circumference of a circle with diameter 1 inch is pi inches.
But we only have half a circle, or semicircle. So we cut this in half to get pi/2. This is the curved distance around the ice cream cone shape.
The straight line distances of 1 and 1 are also part of the perimeter. So that's how we get the perimeter to be pi/2 + 1 + 1. We do not add the dotted line as part of the perimeter because it is not on the outside or exterior.
Use of a calculator will show that pi/2+1+1 = 3.57 approximately, so this is another way to express the perimeter.
