1/2*base of triangle*height(the perpendicular)=Area of right angled triangle
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Pythagoras's' theorem or "got an want" on a right angled triangle but use sine rule on a non right angled triangle !! ..
For all triangles, right-angled included, it is the multiplication of the base length times the perpendicular height x half. Algebraically A = 0.5bh For a right-angled triangle it is the base length times to length of right angled (perpendicular) line times one half.
Pythagoras
It depends on what else you know about the triangle.
It is a right angled triangle with legs of equal length.