Question

Find the area of an isosceles triangle each of whose equal side measure 13cm and whose base measure 20cm

Answer 1

We drop a perpendicular from the vertex.

Call it lenght h

We know that this line divises the base into 2 equal parts.

From pythagoras theorem,

10²+h²=13²

100+h²=169

h²=69

h=√69

Area of a triangle is 1/2xbxh

=1/2x20x√69

=10√69 sq cm

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Answer 2

Here is ir answer⬇⬇
Hope this will help u..