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4-76.
  1. A circle of radius 10 cm cut out of cardboard weighs 120 g. Homework Help ✎

    1. How much would a 60° sector weigh?

    2. How much would a circle of radius 15 cm cut out of the same cardboard weigh?

What part of the entire cardboard would 60° represent?

What is the area of a circle?

Set up information involving area and weight.

Set up a proportion and solve for the new weight.

Acircle = πr2

Aoriginal = 100π
Weightoriginal = 120
Anew = 15²π = 225π
Weightnew = ???