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30-60-90 rules
Hypotenuse
2*shorter leg
30-60-90 rules
Long leg
Square root of 3 * shorter leg
45-45-90 rules
Leg
Hypotenuse/ square root of 2
45-45-90 rules
Hypotenuse
Square root of 2 * leg
Rectangle
Bh
Parallelogram
Bh
Triangle
½ bh
Trapezoid
½ h(b1 + b2)
Kite
½ d1 *d2
Rhombus
½ d1*d2
Bh
Square
Bh
½ d1*d2
circle
Pie r²
Regular polygon
½ap
Interior angles sum
N-2×180