These are the following ways to calculate the area , where area for 2D shapes and Surface Area for 3D shapes

Circle

π × (r)^2

r = radius of the circle

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Triangle

½ × b × h

b = base

h = height

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Square

s^2

s = length of side

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Rectangle

b × h

b = length

h = width

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Parallelogram

b × h

b = base

h = vertical height

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Trapezium

½(a + b) × h

a & b are length of parallel sides

h = height

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Ellipse

π×a×b

a = ½ minor axis

b = ½ major axis

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Solid Sphere

4 × π × r × r

r = radius

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Hemisphere

3 × π× r × r

r = radius

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Right Prism

((b × h)+(2 × l × s)+(l × b))

S= side

l = Length

b = base

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Right Prism

Height: The height is a lateral edge.

Side faces: Side faces are rectangles.

Surface Area: ((b × h)+(2 × l × s)+(l × b))

Oblique Prism

Height: Height is an altitude outside the prism.

Side faces:

Sides faces are parallelograms.

Surface Area= ((b × h)+(2 × l × s)+(l × b))

:

Cylinder

4 x π x r + 2 x h

r = Radius of the circular base of the cylinder

h = Height of the cylinder

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