Respuesta :

Answer:

If the diameter is 12, the 90° arc is (1/4)Π(12), or 3Π (approximately 9.42).

Step-by-step explanation:

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Modestowl
a. Diameter =1cm
Radius = diameter/2
Radius =1/2
Circumference =2x22/7x1/2
=44/14 = 22/7
=3.14cm

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