Upper and Lower Sums

Pythagorean Regular Polygon

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Area of a Circle

Similar Triangles , Area and Perimeter

If two triangles ABC and PQR are similar (ΔABC ∼ ΔPQR) , then their corresponding sides are proportional and corresponding angles are equal i.e. PQ/AB = QR/BC = RP/CA. 

The ratio of areas of similar triangles is the square of the ratio of their sides i.e.   Area PQR / Area ABC = (PQ/AB)² 

The ratio of perimeters of similar triangles is the ratio of their sides i.e. 
 Perimeter PQR / Perimeter ABC = PQ/AB


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Pythagoras Theorem and Semicircles

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Triangle Puzzle - I

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Properties of an Equilateral Triangle

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Area of a Triangle

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Area of a Parallelogram

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Area of Triangle

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Maximum Area of Right Triangle with given Hypotenuse

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Maximum Area of Rectangle - Fixed Perimeter

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Medial Triangle - I

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Area of Circle - I

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