→ Geometry →开始学习 /下载MP3 Flashcards

开始学习

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

geometry