(1) Create an interface Graph, which has three abstract methods: <1> getPerimeter() for calculating the perimeter, the return value is double type; <2> getArea () for calculating the area, the return value is double ... - Code World

(1) Create an interface Graph, which has three abstract methods: <1> getPerimeter() for calculating the perimeter, the return value is double type; <2> getArea () for calculating the area, the return value is double ...

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(1) Create an interface Graph, which has three abstract methods: <1> getPerimeter() for calculating the perimeter, the return value is double type; <2> getArea () for calculating the area, the return value is double ...

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