### Obtuse Angles Inscribed in Circle Proof

Illustration of a circle used to prove "Any angle inscribed in a segment less than a semicircle is an…

### Circle With Inscribed Right Angle in Semicircle

Illustration of a circle with a right angle inscribed in a semicircle.

### Circle with Segment, Semicircle, Sector, Quadrant, and Central Angle

Illustrations of a circle with segment, semicircle, sector, quadrant, and central angles drawn.

### Circular Design

Circular design made by rotating circles about a fixed point. The radii of the smaller circles is equal…

### Circular Design

Circular design made by rotating circles about a fixed point. The radii of the smaller circles is equal…

### Roman Lunette Panel

The Roman lunette panel is a semicircle typically found on door-head.

### Parallelogram Used to Construct Equivalent Square

Illustration of a how to construct a square equivalent to a given parallelogram.

### Protractor

"The outer edge is a semicircle, with center at 0, and is divided into 360 parts. Each division is one-half…

### Protractor

A protractor is a semicircular tool for measuring angles in degrees.

### Protractor, 10 Degrees

A protractor indicating a measurement of 10 degrees.

### Protractor, 10 Degrees

A protractor indicating a measurement of 10 degrees from the right side.

### Protractor, 100 Degrees

A protractor indicating a measurement of 100 degrees.

### Protractor, 100 Degrees

A protractor indicating a measurement of 100 degrees from the right side.

### Protractor, 105 Degrees

A protractor indicating a measurement of 105 degrees.

### Protractor, 105 Degrees

A protractor indicating a measurement of 105 degrees from the right side.

### Protractor, 110 Degrees

A protractor indicating a measurement of 110 degrees.

### Protractor, 110 Degrees

A protractor indicating a measurement of 110 degrees from the right side.

### Protractor, 115 Degrees

A protractor indicating a measurement of 115 degrees.

### Protractor, 115 Degrees

A protractor indicating a measurement of 115 degrees from the right side.

### Protractor, 120 and 60 Degrees

A protractor with 120 and 60 degree suplementary angles indicated.

### Protractor, 120 Degrees

A protractor indicating a measurement of 120 degrees.

### Protractor, 120 Degrees

A protractor indicating a measurement of 120 degrees from the right side.

### Protractor, 125 Degrees

A protractor indicating a measurement of 125 degrees.

### Protractor, 125 Degrees

A protractor indicating a measurement of 125 degrees from the right side.

### Protractor, 130 Degrees

A protractor indicating a measurement of 130 degrees.

### Protractor, 130 Degrees

A protractor indicating a measurement of 130 degrees from the right side.

### Protractor, 135 and 45 Degrees

A protractor with 135 and 45 degree suplementary angles indicated.

### Protractor, 135 Degrees

A protractor indicating a measurement of 135 degrees.

### Protractor, 135 Degrees

A protractor indicating a measurement of 135 degrees from the right side.

### Protractor, 140 Degrees

A protractor indicating a measurement of 140 degrees.

### Protractor, 140 Degrees

A protractor indicating a measurement of 140 degrees from the right side.

### Protractor, 145 Degrees

A protractor indicating a measurement of 145 degrees.

### Protractor, 145 Degrees

A protractor indicating a measurement of 145 degrees from the right side.

### Protractor, 15 Degrees

A protractor indicating a measurement of 15 degrees.

### Protractor, 15 Degrees

A protractor indicating a measurement of 15 degrees from the right side.

### Protractor, 150 and 30 Degrees

A protractor with 150 and 30 degree suplementary angles indicated.

### Protractor, 150 Degrees

A protractor indicating a measurement of 150 degrees.

### Protractor, 150 Degrees

A protractor indicating a measurement of 150 degrees from the right side.

### Protractor, 155 Degrees

A protractor indicating a measurement of 155 degrees.

### Protractor, 155 Degrees

A protractor indicating a measurement of 155 degrees from the right side.

### Protractor, 160 Degrees

A protractor indicating a measurement of 160 degrees.

### Protractor, 160 Degrees

A protractor indicating a measurement of 160 degrees from the right side.

### Protractor, 165 Degrees

A protractor indicating a measurement of 165 degrees.

### Protractor, 165 Degrees

A protractor indicating a measurement of 165 degrees from the right side.

### Protractor, 170 Degrees

A protractor indicating a measurement of 170 degrees.

### Protractor, 170 Degrees

A protractor indicating a measurement of 170 degrees from the right side.

### Protractor, 175 Degrees

A protractor indicating a measurement of 175 degrees.

### Protractor, 20 Degrees

A protractor indicating a measurement of 20 degrees.

### Protractor, 20 Degrees

A protractor indicating a measurement of 20 degrees from the right side.

### Protractor, 25 Degrees

A protractor indicating a measurement of 25 degrees.

### Protractor, 25 Degrees

A protractor indicating a measurement of 25 degrees from the right side.

### Protractor, 30 and 150 Degrees

A protractor with 30 and 150 degree suplementary angles indicated.

### Protractor, 30 Degrees

A protractor indicating a measurement of 30 degrees.

### Protractor, 30 Degrees

A protractor indicating a measurement of 30 degrees from the right side.

### Protractor, 35 Degrees

A protractor indicating a measurement of 35 degrees.

### Protractor, 35 Degrees

A protractor indicating a measurement of 35 degrees from the right side.

### Protractor, 40 Degrees

A protractor indicating a measurement of 40 degrees.

### Protractor, 40 Degrees

A protractor indicating a measurement of 40 degrees from the right side.

### Protractor, 45 and 135 Degrees

A protractor with 45 and 135 degree suplementary angles indicated.

### Protractor, 45 Degrees

A protractor indicating a measurement of 45 degrees.