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Name Date, JP], GEOMETRY QUICK GUIDE 4: 2D SHAPES FORMULAS | @av, , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , TRIANGLE FORMULAS CIRCLE FORMULAS QUADRILATERAL FORMULAS, Angles in a triangle add up to Parts of a circle Angles in a quadrilateral add up to, 180°. Soa+b+c=180° 360°.Soat+b+c+d= 360°, b, " (3 " fs ", >, b b, Area of a triangle Circumference of a circle Area of a rectangle = b x h, =’%xbxhor%bh = 2nrornd Perimeter of a rectangle = 2b + 2h, c, b h, nnn, a b, Pythagoras’ theorem Area of a circle Area of a parallelogram, Ina right triangle a? + b? = c? =nr =bxh, b2, h, SY, Z) CI L\ T b1, a, Basic trigonometry laws The length L of an arc Area of a trapezium, sin @ = o/h = 2nr(6/360) =%(b1+b2)xh, cos 8 =a/h The area of a sector, tan @=o0/a = nr’ (8/360), , , , , , , , , , Free Math Sheets, Math Games and Math Help, , KTH-SALAMANDERS.COM