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The idea came to him when he was taking a bath - stepping into a bathtub, he noticed that the water level rose. If it's an irregular shape, you can try to do the very thing that caused Archimedes to shout the famous word Eureka! Probably you heard that story - Archimedes was asked to find out if the Hiero's crown is made from pure gold or just gold-plated - but without bending or destroying it. For a right triangular prism, the equation can be easily derived, as well as for a right rectangular prism, which is apparently the same shape as a box.įor regular three-dimensional objects, you can easily calculate the volume by taking measurements of its dimensions and applying the appropriate volume equation. Prism = A h Ah A h, where A A A is a base area and h h h is the height. For a pyramid with a regular base, another equation may be used as well: Pyramid = ( n / 12 ) h s 2 cot ⁡ ( π / n ) (n/12) h s^2 \cot(\pi/n) ( n /12 ) h s 2 cot ( π / n ), where n n n is a number of sides s s s of the base for a regular polygon. Pyramid = ( 1 / 3 ) A h (1/3)Ah ( 1/3 ) A h where A A A is a base area and h h h is the height. Rectangular solid (volume of a box) = l w h lwh lw h, where l l l is the length, w w w is the width and h h h is the height (a simple pool may serve as an example of such shape). Sphere = ( 4 / 3 ) π r 3 (4/3)\pi r^3 ( 4/3 ) π r 3, where r r r is the radius.Ĭylinder = π r 2 h \pi r^2h π r 2 h, where r r r is the radius and h h h is the height.Ĭone = ( 1 / 3 ) π r 2 h (1/3)\pi r^2h ( 1/3 ) π r 2 h, where r r r is the radius and h h h is the height. Here are the formulas for some of the most common shapes:Ĭube = s 3 s^3 s 3, where s s s is the length of the side. If the base triangle's two sides 'a' and 'b' and the included angle 'θ' are given, then its area is found using the formula 1/2 ab sin θ square units.There is no simple answer to this question, as it depends on the shape of the object in question.The formula is also known as Heron's formula. The same formula can be applied for an isosceles triangle or an equilateral triangle. If the type of base triangle is scalene, where all three sides 'a', 'b', and 'c' are given, then its area is calculated using √ square units.If the base triangle is an isosceles triangle with its sides to be 'a', 'a', and 'b' then its area is (b/4) × √(4a 2 - b 2 ) square units.If the base triangle is a right-angled triangle or the prism is called a right triangular prism, with two legs 'b' and 'h' then its area is (1/2) bh square units.If the triangle's height 'h' and base 'b' are given, then its area is (1/2) bh square units.If the triangle base is equilateral or the prism is called an equilateral triangular prism with each side 'a', then its area is √3a 2 /4 square units.Here b is the base length, h is the height of the triangle and l is the length between the triangular bases.įormulas to find the Base Area of different trianglesįollowing are the formulas used to find the base area of different types of triangles. Volume of triangular prism = ½ x b x h x l = ½ bhl

The base area = ½ bh, where b is the base length and h is the height of the triangle. Since the prism base is in triangular shape, Volume of a triangular prism = area of base triangle x height The volume of a triangular prism can be calculated by taking the product of the height of the prism and the area of the triangular base. It is measured in cubic units such as cm 3, m 3 etc.

In simple words, the volume of a triangular prism refers to the space inside it. The volume of a triangular prism is the space occupied by it from all the three dimensions. The height (h) of the triangular prism is the perpendicular distance between the centres of the two parallel bases.

A prism is called a regular or uniform triangular prism if its sides are squares and bases are equilateral.

If the sides of the prism are rectangular, it is called a right triangular prism and otherwise it is called an oblique triangular prism. The two triangular bases of the prism are parallel and congruent to each other. The edges and vertices of the prism base are joined with one another via the three rectangular sides. It can also be considered a pentahedron, as it has five faces. A triangular prism is a polyhedron having two triangular bases and three rectangular faces.