Isosceles Trapezoid Formulas

Sir SagarJanuary 10, 2015January 10, 20150

Isosceles Trapezoid Formulas

Bases of a trapezoid: a, b

Leg : c

Midline: q

Altitude: h

Diagonal: d

Radius of circumscribed circle: R

Area: S

1. $q = \fac{a+b}{2}$
2. d = $\sqrt{ab + c^{2}}$
3. $h = \sqrt{c^{2}-\frac{1}{4}(b - a)^{2}}$
4. $R = \frac{c\sqrt{ab+c^{2}}}{(2c - a +b)(2c+a-b)}$
5. $S = \frac{a+b}{2}\cdot h = qh$

Isosceles Trapezoid Formulas

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