# Category: Flat figures

## The length of the sides of the rectangle

A rectangle is a quadrilateral with all angles equal to 90 degrees. Find the side length of a rectangle by knowing the diagonal and the…

## Equilateral triangle side length

An equilateral, or conformal, triangle is a regular polygon with three sides, the simplest of regular polygons. All sides of a regular triangle are equal…

## Length of base of an isosceles triangle

An isosceles triangle is a triangle in which the two sides are equal in length. Equal sides are called lateral, and the last unequal side…

## Side of triangle

To find the side of a triangle, knowing its two sides and the angle between them, you can use the cosine theorem. To do this,…

## Chord length of a circle

Chord is a segment connecting any two points of a circle. The diameter of the circle, the largest chord. Chord length formula: L=2 R sin(α…

## Arc length

An arc is a part of a circle. The arc length is the distance along the portion of the circle that forms the arc.The circumference…

## Perimeter of a quadrilateral

A quadrilateral is a geometric figure with four sides and the same number of corners. Finding the perimeter of a quadrilateral is very easy! To…

## Perimeter of a parallelogram

A parallelogram is a quadrilateral in which opposite sides are pairwise equal and parallel to each other. By the property of a parallelogram, its opposite…

## Rhombus perimeter

A rhombus is a parallelogram with all sides equal. The perimeter of a rhombus is equal to the sum of the lengths of all sides.…

## Perimeter of a rectangle

A rectangle is a quadrangle with four right angles and sides that are equal in pairs. The perimeter of a rectangle is the sum of…