Q: What is a triangle in a semicircle?

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It is a plane figure, for example, a semicircle, a triangle, a kite.

A quarter of a whole circle or half a semicircle

Calculating the radius of a semicircle depends on what information about the semicircle is given.

A semicircle means a half circle.

The complete arc of a semicircle is 180 degrees

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Diameter of semicircle = 1 Area of semicircle = Pi/8 Area of triangle = 0.25 Area outside triangle = (Pi/8) - 0.25 = 0.1427 (rounded to 4th decimal).

All triangles inscribed in a semicircle with one side of the triangle being the diameter of the semicircle are right triangles.

plane figure

90

It is a plane figure, for example, a semicircle, a triangle, a kite.

A quarter of a whole circle or half a semicircle

Yes. It follows from one of the circle theorems which states that the angle subtended in a semicircle is a right angle.

No, a semicircle is not a quadrilateral

Semicircle

The possessive form is semicircle's.

Calculating the radius of a semicircle depends on what information about the semicircle is given.

A semicircle means a half circle.