# Geometry questions

This is a list of recently added questions about geometry. Play geometry quiz and see all the questions.## 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

47%

Hippocrates hairpin

Hippocrates hairpin

29

Spiral of Archimedes

Spiral of Archimedes

103

Euclid's crust

Euclid's crust

53

Spiral of Theodorus

Spiral of Theodorus

167

## 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

40%

in 1555

in 1555

152

in 1666

in 1666

477

in 1777

in 1777

760

in 1888

in 1888

487

## 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

hard

58%

Oval convex discs

Oval convex discs

118

One-sided convex disc

One-sided convex disc

125

Oval biconcave disks

Oval biconcave disks

425

Sphere

Sphere

60

## 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

22%

Tales' sails

Tales' sails

41

Pythagorean sickles

Pythagorean sickles

42

Archimedes' arches

Archimedes' arches

41

lune of Hippocrates,

lune of Hippocrates,

37

## 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

54%

1cm, 2cm, 3cm

1cm, 2cm, 3cm

1023

4cm, 5cm, 6cm

4cm, 5cm, 6cm

128

7cm, 8cm, 9cm

7cm, 8cm, 9cm

135

All of the answers are correct

All of the answers are correct

600

## 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

377

90-180

90-180

9023

0-90

0-90

296

180-360

180-360

2032

## If Earth's radius was larger by 1 meter, how much longer would its equator be?

By approx 6 meters. For each circle, the length of the circumference is c=2πr. Hence, if a radius grows by 1 meter, the circumference grows by 2 π meters - no matter what the initial value of radius was.

Created by: SpikeMe

hard

45%

by approx 6 meters

by approx 6 meters

13398

by approx 6 kilometers

by approx 6 kilometers

5247

by approx 60 kilometers

by approx 60 kilometers

6127

by approx 6000 kilometers

by approx 6000 kilometers

4510

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