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Question		Answer
The area of triangle. start learning		(bc*sin α) /2; \\|p(p-a)(p-b)(p-c)\
The h of equilateral triangle. start learning		(a \\|3) / 2
The area of equilateral triangle. start learning		(a" \\|3) / 4
The area of square. start learning		a"; d"/2
The area of rhombus. start learning		podsh; d1d2 /2
The area of parallelogram. start learning		baseh; absin α
Break up the base of equilateral trapeze. start learning		/_ _ =(a+b)/2;``_\=(a-b)/2
The base of rectangular triangle. start learning		a+b-2r
For rectangular triangle: s= (base) start learning		base/2
For rectangular triangle. Where base=c: h"= (c) start learning		c1*c2
If it is possible to enter a circle into polygon, it's area equals start learning		rp
If diagonals of quadrangle d1 & d2 intersect at an α angle, the area equals start learning		(d1d2sin α) /2
Cos theorem for α angle start learning		a²= b² + c² - 2bc*cos α
Sine theorem start learning		a / sin α = b / sin β = c / sin γ = 2R

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