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

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