# Geometry questions

This is a list of recently added questions about geometry. Play geometry quiz and see all the questions.## What is the approximate value of the golden ratio ("phi")?

1.61. In mathematics, two quantities are in the golden ratio if their ratio is the same as the ratio of their sum to the larger of the two quantities. It is often used for aesthetics in art and design.

Created by: Ninjai

hard

47%

3.14

3.14

1179

2.16

2.16

1620

1.61

1.61

3022

0.87

0.87

514

## Which quadric surface is shaped like a saddle?

Hyperbolic paraboloid. The widely sold fried snack food Pringles potato chips resemble a truncated hyperbolic paraboloid. The distinctive shape of these chips allows them to be stacked in sturdy tubular containers, fulfilling a design goal that they break less easily than other types of chip.

Created by: Ninjai

hard

44%

parabolic cylinder

parabolic cylinder

129

elliptic paraboloid

elliptic paraboloid

418

hyperbolic paraboloid

hyperbolic paraboloid

675

elliptic hyperboloid

elliptic hyperboloid

299

## The geometrical structure depicted in the picture is called ...

Spiral of Theodorus. In geometry, the spiral of Theodorus is a spiral composed of contiguous right triangles. It was first constructed by Theodorus of Cyrene.The principle of construction is based on the Pythagorean theorem.

Created by: Tschuka

hard

50%

Hippocrates hairpin

Hippocrates hairpin

72

Spiral of Archimedes

Spiral of Archimedes

226

Euclid's crust

Euclid's crust

118

Spiral of Theodorus

Spiral of Theodorus

423

## In which year did Leonhard Euler introduced the symbol "i" to represent the square root of -1 ?

In 1777. The letter "i" as a designation of the element from -1 was proposed by Leonhard Euler in 1777. Later, from 1801, this designation was popularized by Carl Friedrich Gauss. Currently, it is the most commonly used symbol of the imaginary unit.

Created by: Tschuka

hard

43%

in 1555

in 1555

193

in 1666

in 1666

586

in 1777

in 1777

1043

in 1888

in 1888

596

## What is the shape do erythrocytes in human blood?

Oval biconcave disks. In humans, mature red blood cells are flexible and oval biconcave discs. They lack a cell nucleus and most organelles, in order to accommodate maximum space for hemoglobin; they can be viewed as sacks of hemoglobin, with a plasma membrane as the sack. Approximately 2.4 million new erythrocytes are produced per second in human adults.

Created by: Tschuka

average

61%

Oval convex discs

Oval convex discs

292

One-sided convex disc

One-sided convex disc

330

Oval biconcave disks

Oval biconcave disks

1237

Sphere

Sphere

156

## The illustration shows the figure known in mathematics as;

Lune of Hippocrates,. In geometry, the lune of Hippocrates, named after Hippocrates of Chios, is a lune bounded by arcs of two circles, the smaller of which has as its diameter a chord spanning a right angle on the larger circle. Equivalently, it is a non-convex plane region bounded by one 180-degree circular arc and one 90-degree circular arc. It is the first curved figure to have its exact area calculated mathematically.

Created by: Tschuka

very hard

25%

Tales' sails

Tales' sails

77

Pythagorean sickles

Pythagorean sickles

73

Archimedes' arches

Archimedes' arches

69

lune of Hippocrates,

lune of Hippocrates,

73

## A triangle can NOT have sides of ...

1cm, 2cm, 3cm. The triangle inequality states that the sum of the lengths of any two sides of a triangle must be greater than or equal to the length of the third side

Created by: lukasz Poland

hard

55%

1cm, 2cm, 3cm

1cm, 2cm, 3cm

1328

4cm, 5cm, 6cm

4cm, 5cm, 6cm

157

7cm, 8cm, 9cm

7cm, 8cm, 9cm

170

All of the answers are correct

All of the answers are correct

724

## How many degrees an obtuse angle can have ?

90-180. The obtuse angle may measure from 90 to 180 degrees. Angles having a degree of 0 to 90 are acute angles, whereas those from 180 to 360 - concave angles.

Created by: TotalBellend

easy

76%

0-360

0-360

385

90-180

90-180

9057

0-90

0-90

302

180-360

180-360

2072

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