# Diamond

Rhombus has side 17 cm and and one of diagonal 22 cm long. Calculate its area.

Result

S =  285.2 cm2

#### Solution:

$S = 2 S_1 \ \\ \Delta ABC: a=17 \ a=17 \ u=22 \ \\ s = (a+a+u)/2 = (17 + 17 + 22)/2 = 28 \ cm \ \\ S_1 = \sqrt{ s(s-a)(s-a)(s-u)} \ \\ S_1 = \sqrt{ 28\cdot (28-17)(28-17)(28-22)} = 142.58 \ cm^2 \ \\ S = 2 S_1 = 2 \cdot 142.58 = 285.2 \ \text{cm}^2$

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