Question

An isosceles triangle with equal sides 8 cm and unequal side 2 cm find the area

Answer 1

$use \: herons \: formula \\ = \sqrt{s(s - a)(s - b)(s - c)} \\ s = \frac{a + b + c}{2 } \\ substitute \: a = 8 \\ b = 8 \\ c = 2 \\ so \: s = 9 \\area = \sqrt{9 \times 1 \times 1 \times 7 } \\ = \sqrt{63}$