Introduction. 19 26. A right - angled triang-le is onewhich has a right augle. The side opposite the right angle iscalled the hypotenuse. An acute - angled triangle isone which has three acute angles. It will appear later that everytriangle has at least two acnteangles. An obtuse-angled triangle… … The Circle. 27. A circle is a plane figure contained by one linewhich is called the circumference, and is such thatall straight lines drawn from a certain point within it,called the centre, to the circumference are equal toone another. A radius ot a circle is a straightline drawn from the centre to…
Geometry · Geometry, Plane
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