Geometry

Semicircle Area Calculator

Area and curved-plus-diameter perimeter of a semicircle from radius.

Area

Perimeter

This free Semicircle Area Calculator covers Area and curved-plus-diameter perimeter of a semicircle from radius.

Area is half of π r²; perimeter is π r + 2r. Other geometry tools are linked below.

Semicircle Area Calculator — how it works

Area and curved-plus-diameter perimeter of a semicircle from radius. Typical inputs are Radius r. How it works beside the form states the identity the Semicircle Area Calculator applies.

FAQ

How do I use the Semicircle Area Calculator?

Open the Semicircle Area Calculator, fill Radius r, and read the result. Area is half of π r²; perimeter is π r + 2r.

What formula does the Semicircle Area Calculator use?

The Semicircle Area Calculator uses the identity in How it works. In words: Area is half of π r²; perimeter is π r + 2r.

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