Question

find area of rhombus whose one side is 13 cm and altitude is 10 c​

Answer 1

Answer

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Using the formulas

$a = \frac{pq}{2}$

$a = \sqrt{p2 + q2} \div 2$

solving for A

$a \: = \frac{1}{2} p \: \sqrt{4a2 - p2}$

$= \frac{1}{2}.10. \sqrt{4.13 |2| - 10 |2| } = 120cm2$