2D shapes: formulas Flashcards by Joana B:B | Brainscape

Q

area of a triangle:

A

1/2 x base x height

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Q

area of a parallelogram:

A

base x height

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Q

area of a rectangle:

A

length x width

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Q

area of a trapezoid:

A

1/2 x (sum of parallel lines) x height

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Q

circumference of an area: circle

A

-c = 2πr
-A = πr²

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Q

length of an arc:

A

θ/360 x 2πr

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Q

area of a sector:

A

θ/360 xπr²

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