# What Do You Know About The Equal Incircles Theorem?

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Questions: 10 | Attempts: 118  Settings  Derived from a Sangaku (calculation tablet), the equal incircles theorem is one of the important theorems in the study of size, shape, relative position of figures, and the properties of space. It states that the incircles of triangles formed by any given ray are equal to the base line and those formed by every other ray.

• 1.

### Where did the equal incircles theorem originate from?

• A.

Japan

• B.

China

• C.

Tokyo

• D.

Berlin

A. Japan
Explanation
The equal incircles theorem is a geometric theorem that states that if two triangles have the same inradius, then their areas are equal. This theorem originated from Japan.

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• 2.

### Which is a basic hyperbolic function?

• A.

Sinh

• B.

Cosec

• C.

Sine

• D.

Tan

A. Sinh
Explanation
Sinh is a basic hyperbolic function. The hyperbolic functions are analogs of the trigonometric functions, but they are defined using exponential functions instead of circular functions. Sinh, which stands for hyperbolic sine, is one of the six basic hyperbolic functions. It is defined as the ratio of the exponential function to its inverse. Sinh is commonly used in mathematics and physics to model various phenomena, such as the shape of a hanging cable or the growth of certain populations.

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• 3.

### Which of these represents the size of a hyperbolic angle?

• A.

Twice the area of its hyperbolic sector

• B.

Half the area of its hyperbolic sector

• C.

Thrice the area of its hyperbolic sector

• D.

One quarter the area of its hyperbolic sector

A. Twice the area of its hyperbolic sector
Explanation
The size of a hyperbolic angle is represented by twice the area of its hyperbolic sector. This means that the angle is equal to two times the area enclosed by the hyperbolic sector.

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• 4.

### What is a geometric figure that divides a hyperbola called?

• A.

Lateral angle

• B.

Hyperbolic inverse

• C.

Hyperbolic sector

• D.

Hyperbolic angle

D. Hyperbolic angle
Explanation
A hyperbolic angle is a geometric figure that divides a hyperbola. It is a measure of the opening between the two branches of the hyperbola. This angle is formed by two intersecting lines, one passing through the center of the hyperbola and the other intersecting the hyperbola at two points. The hyperbolic angle helps in understanding the properties and characteristics of the hyperbola.

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• 5.

### What is a region of the Cartesian plane bounded by rays from the origin to two points and by the rectangular hyperbola?

• A.

Hyperbolic area

• B.

Hyperbolic sector

• C.

Hyperbolic function

• D.

Hyperbolic inverse

B. Hyperbolic sector
Explanation
A hyperbolic sector is a region of the Cartesian plane that is bounded by rays from the origin to two points and by the rectangular hyperbola. It is a geometric shape formed by the intersection of the hyperbola and the rays emanating from the origin. The term "hyperbolic" refers to the rectangular hyperbola, which is a curve defined by the equation xy = c, where c is a constant. Therefore, the correct answer is hyperbolic sector.

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• 6.

### What is the area of a hyperbolic sector in a standard position?

• A.

Ln b

• B.

Sin b

• C.

Ln c

• D.

Sin c

A. Ln b
Explanation
The correct answer is ln b because the area of a hyperbolic sector in a standard position is equal to the natural logarithm of the secant of the angle subtended by the sector. In this case, the angle is represented by b, so the area is ln b.

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• 7.

### What does a hyperbolic sector determine when in a standard position?

• A.

Hyperbolic triangle

• B.

Hyperbolic angle

• C.

Right triangle with one vertex at the origin

• D.

Third vertex on the hyperbola

B. Hyperbolic angle
Explanation
A hyperbolic sector determines a hyperbolic angle when in a standard position. In mathematics, a hyperbolic angle is an angle formed by two intersecting hyperbolas in the hyperbolic plane. It is similar to a regular angle in Euclidean geometry but follows the rules and properties of hyperbolic geometry. The hyperbolic angle is determined by the measure of the arc between the two hyperbolas and is an important concept in the study of hyperbolic geometry.

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• 8.

### How many parts has a hyperbola?

• A.

4

• B.

3

• C.

2

• D.

1

B. 3
Explanation
A hyperbola has three main parts: the two branches, which are the curved parts that extend outward from the center, and the center, which is the point where the two branches intersect. Each branch of the hyperbola is symmetrical and opens in opposite directions. Therefore, the correct answer is 3.

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• 9.

### What is a classification of smooth curve lying in a plane, which is defined by its geometric properties?

• A.

Hyperbola

• B.

Hyperbolic angle

• C.

Cartesian plane

• D.

Hyperbolic sector

A. Hyperbola
Explanation
A hyperbola is a classification of a smooth curve lying in a plane that is defined by its geometric properties. It is characterized by two distinct branches that are symmetric about the center. The shape of a hyperbola is determined by its eccentricity, which is the ratio of the distance between the foci to the length of the major axis. The properties of a hyperbola, such as its asymptotes and foci, can be used to define its shape and position in the plane. Therefore, a hyperbola is the correct answer as it fits the given description.

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• 10.

### What are the two fixed points on a hyperbola called?

• A.

Foci

• B.

Loci

• C.

• D.

Ellipsis Back to top