Question

formula of perimeter and area

Answer 1

Rectangle

P : 2 ( l + b )

A : length × width

Square

P : side × 4

A : side²

Circle ○

P : 2 × π × radius

A : π × radius ²

Parallelogram

P : 2 ( side 1 + side 2 )

A : base × height

Trapezium

P : side 1 + side 2 + side 3 + side 4

A : ½ × sum of parallel sides × height

☆ Triangle Area : b × h × ½

☆ Perimeter : sum of all sides

Equilateral Triangle

P : side × 3

Right Angle ∆

A : √s (s-a)(s-b)(s-c) {root for the whole}

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