The two equal sides of an isosceles triangle is 20 cm each and the third side is 30 cm. What is the area(in sq.cm) of the triangle?

The two equal sides of an isosceles triangle is 20 cm each and the third side is 30 cm. What is the area(in sq.cm) of the triangle?
1). $50\sqrt{5}$
2). 100
3). $75\sqrt{7}$
4). 175

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