Mensuration

hi yall study wellll-mensuration formulas and

area

The space occupied by a given surface (flat side) of an object.

volume

the space occupied by an entire object

perimeter

length covered by the boundary of an object

parallelogram

opposite sides are parallel lines and have equal length.

trapezium

only one set of opposite sides are parallel lines. all sides can have different lengths.

sphere

3d figure of a circle

prism

at the bottom, it is a parallelogram. 2 sides are extended into triangles and the other 2 sides are extended into parallelograms.

cylinder

at the bottom and top, it has circles. the lines joining the circles are parallel

isosceles triangle

having 2 equal sides

equilateral triangle

having all sides equal

right angled triangle (or right triangle)

having one angle 90 degree

square

has parallel lines on opposite sides. all sides have equal length. all corners are at 90 degree.

cube

3d figure of a square

rectangle

has parallel lines on opposite sides. equal length only on opposite sides. all corners are at 90 deg

cuboid

3d figure of a rectangle

circle

any line drawn from the center to the boundary has equal length

arc of a circle

part of the boundary of a circle

pyramid

At the bottom, it is a square or a rectangle. each side is extended into an isosceles or equilateral triangle and joined at the top.

cone

at the bottom, it is a circle. each side is extended into an isoceles or equilateral triangle and joined at the top

parallel lines

lines which never join even if extended

radius of a circle or a sphere

A straight line from the center to the boundary of a circle or sphere.

circumference

special name for perimeter of a circle

diameter

A straight line passing from side to side through the center of a circle or sphere.

hypotenuse

the side of a right triangle opposite the right angle

Surface area

The sum of all the areas of all surfaces (faces) of a solid.