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But . I'll let both equal h:
Area of a triangle is . The base is OB and the height is AC:
There are 8 isosceles triangles, so multiply the area by 8.
A quick way to find the area the a triangle is:
where are the lengths of sides of the triangle and is the angle between those sides.
That would give us of each of the triangles at once.
That is true, if you know trig. I had no idea if the OP learned trig or not.
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