An isosceles triangle has base $30$ cm and area $240\text{ cm}^2$. Find its perimeter. $30$ \(

Question

An isosceles triangle has base $30$ cm and area $240\text{ cm}^2$. Find its perimeter. $30$ $240\text{ cm}^2$ All lengths are in centimetres. Give non-exact answers to 3 significant figures unless an exact value is requested.

Accepted Answer

$\text{Perimeter}=30+2\sqrt{481}=73.9\text{ cm}$ (3 s.f.).

Rhombus diagonals and an isosceles triangle

Rhombus diagonals and an isosceles triangle

Solution:

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